Thermon Industries, Inc. $210,000,000 Aggregate Principal Amount of 9.50% Senior Secured Notes due 2017 REGISTRATION RIGHTS AGREEMENT

Subsequent Shelf Registrations. If the Initial Shelf Registration or any Subsequent Shelf Registration (as defined below) ceases to be effective for any reason at any time during the Effectiveness Period (other than because of the sale of all of the securities registered thereunder), the Company shall (and shall cause each Guarantor to) use its reasonable best efforts to obtain the prompt withdrawal of any order suspending the effectiveness thereof, and in any event shall within 30 days of such cessation of effectiveness amend such Shelf Registration in a manner to obtain the withdrawal of the order suspending the effectiveness thereof, or file (and cause each Guarantor to file) an additional “shelf” Registration Statement pursuant to Rule 415 covering all of the Registrable Notes (a “Subsequent Shelf Registration”). If a Subsequent Shelf Registration is filed, the Company shall (and shall cause each Guarantor to) use its commercially reasonable efforts to cause the Subsequent Shelf Registration to be declared effective as soon as practicable after such filing and to keep such Subsequent Shelf Registration continuously effective for a period equal to the number of days in the Effectiveness Period less the aggregate number of days during which the

Initial Shelf Registration or any Subsequent Shelf Registration was previously continuously effective. As used herein the term “Shelf Registration” means the Initial Shelf Registration and any Subsequent Shelf Registrations

The Company shall notify the Trustee within three Business Days after each and every date on which an event occurs in respect of which Additional Interest is required to be paid (an “Event Date”). Any amounts of Additional Interest due pursuant to clause (a)(i), (a)(ii) or (a)(iii) of this Section 4 will be payable in cash, on the dates and in the manner provided in

the Indenture and whether or not any cash interest would then be payable on such date, commencing with the first such semi-annual date occurring after any such Additional Interest commences to accrue. The amount of Additional Interest will be determined by multiplying the applicable Additional Interest rate by the principal amount of the Notes, multiplied by a fraction, the numerator of which is the number of days such Additional Interest rate was applicable during such period (determined on the basis of a 360-day year comprised of twelve 30-day months and, in the case of a partial month, the actual number of days elapsed), and the denominator of which is 360.

Prepare and file with the SEC as soon as reasonably practicable after completion of the audit of the Parent’s and the Company’s consolidated financial statements for the fiscal year ended March 31, 2010 (including any audit of the financial statements of any subsidiary of the Company organized under any foreign law for such fiscal year) and the issuance of the report of the auditor(s) thereon, but in any event on or prior to the Filing Date, the Exchange Registration Statement or if the Exchange Registration Statement is not filed because of the circumstances contemplated by Section 2(j), a Shelf Registration as prescribed by Section 3, and use its commercially reasonable efforts to cause each such Registration Statement to become effective and remain effective as provided herein; provided that, if (1) a Shelf Registration is filed pursuant to Section 3 or (2) a Prospectus contained in an Exchange Registration Statement filed pursuant to Section 2 is required to be delivered under the Securities Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during the Applicable Period relating thereto, before filing any Registration Statement or Prospectus or any amendments or supplements thereto the Company shall (and shall cause each Guarantor to), if requested, furnish to and afford the Holders of the Registrable Notes to be registered pursuant to such Shelf Registration, each Participating Broker-Dealer, the managing underwriters, if any, and each of their respective counsel, a reasonable opportunity to review copies of all such documents (including copies of any documents to be incorporated by reference therein and all exhibits thereto) proposed to be filed (in each case at least five Business Days prior to such filing; provided, however, that in no event shall the Company or any Guarantor be required to provide to any such Person or their counsel any report, document or material required to be filed by the Company or any Guarantor pursuant to the Exchange Act (except with respect to annual reports on Form 10-K and quarterly reports on Form 10-Q, which shall be furnished at least three Business Days prior

to such filing). The Company and each Guarantor shall not file any such Registration Statement or Prospectus or any amendments or supplements thereto in respect of which the Holders must provide information for the inclusion therein without the Holders being afforded a reasonable opportunity to review such documentation if the holders of a majority in aggregate principal amount of the Registrable Notes covered by such Registration Statement, or any such Participating Broker-Dealer, as the case may be, the managing underwriters, if any, or any of their respective counsel shall reasonably object in writing on a timely basis. A Holder shall be deemed to have reasonably objected to such filing if such Registration Statement, amendment, Prospectus or supplement, as applicable, as proposed to be filed, contains an untrue statement of a material fact or omits to state any material fact necessary to make the statements therein not misleading or fails to comply with the applicable requirements of the Securities Act.

Furnish to such selling Holders and Participating Broker-Dealers who so request in writing (i) upon the Company’s receipt, a copy of the order of the SEC declaring such Registration Statement and any post effective amendment thereto effective, (ii) such reasonable number of copies of such Registration Statement and of each amendment and supplement thereto (in each case including any documents incorporated therein by reference and all exhibits), (iii) such reasonable number of copies of the Prospectus included in such Registration Statement (including each preliminary Prospectus) and each amendment and supplement thereto, and such reasonable number of copies of the final Prospectus as filed by the Company and each Guarantor pursuant to Rule 424(b) under the Securities Act, in conformity with the requirements of the Securities Act and each amendment and supplement thereto, and (iv) such other documents (including any amendments required to be filed pursuant to clause (c) of this Section), as any such Person may reasonably request in writing. The Company and

the Guarantors hereby consent to the use of the Prospectus by each of the selling Holders of Registrable Notes or each such Participating Broker-Dealer, as the case may be, and the underwriters or agents, if any, and dealers, if any, in connection with the offering and sale of the Registrable Notes covered by, or the sale by Participating Broker-Dealers of the Exchange Notes pursuant to, such Prospectus and any amendment or supplement thereto.

If (A) a Shelf Registration is filed pursuant to Section 3, (B) a Prospectus contained in an Exchange Registration Statement filed pursuant to Section 2 is required to be delivered

under the Securities Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during the Applicable Period or (C) reasonably requested in writing by the managing underwriters, if any, or the Holders of a majority in aggregate principal amount of the Registrable Notes being sold in connection with an Underwritten Offering, (i) promptly incorporate in a Prospectus supplement or post-effective amendment such information or revisions to information therein relating to such underwriters or selling Holders as the managing underwriters, if any, or such Holders or any of their respective counsel reasonably request in writing to be included or made therein and (ii) make all required filings of such Prospectus supplement or such post-effective amendment as soon as practicable after the Company has received notification of the matters to be incorporated in such Prospectus supplements or post-effective amendment.

Use its reasonable best efforts to cause the Registrable Notes covered by any Registration Statement to be registered with or approved by such governmental agencies or authorities as may be necessary to enable the seller or sellers thereof or the underwriter, if any, to consummate the disposition of such Registrable Notes, except as may be required solely as a consequence of the nature of such selling Holder’s business, in which case the Company

shall (and shall cause each Guarantor to) cooperate in all reasonable respects with the filing of such Registration Statement and the granting of such approvals; provided that neither the Company nor any Guarantor shall be required to (A) qualify generally to do business in any jurisdiction where it is not then so qualified, (B) take any action that would subject it to general service of process in any jurisdiction where it is not then so subject or (C) subject itself to taxation in any such jurisdiction where it is not then so subject.

If a Shelf Registration is filed pursuant to Section 3, enter into such agreements (including an underwriting agreement in form, scope and substance as is customary in Underwritten Offerings of debt securities similar to the Notes, as may be appropriate in the circumstances) and take all such other actions in connection therewith (including those reasonably requested in writing by the managing underwriters, if any, or the Holders of a majority in aggregate principal amount of the Registrable Notes being sold) in order to expedite or facilitate the registration or the disposition of such Registrable Notes, and in such connection, whether or not an underwriting agreement is entered into and whether or not the registration is an Underwritten Registration, (i) make such representations and warranties to the Holders and the underwriters, if any, with respect to the business of the Company and its subsidiaries as then conducted, and the Registration Statement, Prospectus and documents, if any, incorporated or deemed to be incorporated by reference therein, in each case, in form, substance and scope as are customarily made by issuers to underwriters in Underwritten Offerings of debt securities similar to the Notes, as may be appropriate in the circumstances, and confirm the same if and when reasonably required; (ii) obtain an opinion of counsel to the Company and the Guarantors and updates thereof (which counsel and opinions (in form, scope and substance) shall be reasonably satisfactory to the managing underwriters, if any, and the Holders of a majority in aggregate principal amount of the Registrable Notes being sold), addressed to each selling Holder and each of the underwriters, if any, covering

the matters customarily covered in opinions of counsel to the Company and the Guarantors requested in Underwritten Offerings of debt securities similar to the Notes, as may be appropriate in the circumstances; (iii) obtain “cold comfort” letters and updates thereof (which letters and updates (in form, scope and substance) shall be reasonably satisfactory to the managing underwriters) from the independent certified public accountants of the Company and the Guarantors (and, if necessary, any other independent certified public accountants of any subsidiary of the Company or of any business acquired by the Company for which financial statements and financial data are, or are required to be, included in the Registration Statement), addressed to each of the underwriters, such letters to be in customary form and covering matters of the type customarily covered in “cold comfort” letters in connection with Underwritten Offerings of debt securities similar to the Notes, as may be appropriate in the circumstances, and such other matters as reasonably requested in writing by the underwriters; and (iv) deliver such documents and certificates as may be reasonably requested in writing by the Holders of a majority in aggregate principal amount of the Registrable Notes being sold and the managing underwriters, if any, to evidence the continued validity of the representations and warranties of the Company and its subsidiaries made pursuant to clause (i) above and to evidence compliance with any conditions contained in the underwriting agreement or other similar agreement entered into by the Company or any Guarantor.

All fees and expenses incident to the performance of or compliance with this Agreement by the Company and the Guarantors shall be borne by the Company and the Guarantors, whether or not the Exchange Offer or a Shelf Registration is filed or becomes effective, including, without limitation, (i) all registration and filing fees, including, without limitation, (A) fees with respect to filings required to be made with FINRA in connection with any Underwritten Offering and (B) fees and expenses of compliance with state securities or Blue

Sky laws as provided in Section 6(h) (including, without limitation, reasonable fees and disbursements of counsel in connection with Blue Sky qualifications of the Registrable Notes or Exchange Notes and determination of the eligibility of the Registrable Notes or Exchange Notes for investment under the laws of such jurisdictions (x) where the Holders are located, in the case of the Exchange Notes, or (y) as provided in Section 6(h), in the case of Registrable Notes or Exchange Notes to be sold by a Participating Broker-Dealer during the Applicable Period)), (ii) printing expenses, including, without limitation, expenses of printing Prospectuses if the printing of Prospectuses is requested by the managing underwriter or underwriters, if any, or by the Holders of a majority in aggregate principal amount of the Registrable Notes included in any Registration Statement or by any Participating Broker-Dealer during the Applicable Period, as the case may be, (iii) messenger, telephone and delivery expenses incurred in connection with the performance of their obligations hereunder, (iv) fees and disbursements of counsel for the Company, the Guarantors and, subject to 7(b), the Holders, (v) fees and disbursements of all independent certified public accountants referred to in Section 6 (including, without limitation, the expenses of any special audit and “cold comfort” letters required by or incident to such performance), (vi) rating agency fees and the fees and expenses incurred in connection with the listing of the Securities to be registered on any securities exchange, (vii) Securities Act liability insurance, if the Company and the Guarantors desire such insurance, (viii) fees and expenses of all other Persons retained by the Company and the Guarantors, (ix) fees and expenses of any “qualified independent underwriter” or other independent appraiser participating in an offering pursuant to Section 3 of Schedule E to the By-laws of FINRA, but only where the need for such a “qualified independent underwriter” arises due to a relationship with the Company and the Guarantors, (x) internal expenses of the Company and the Guarantors (including, without limitation, all salaries and expenses of officers and employees of the Company or the Guarantors performing legal or accounting duties), (xi) the expense of any annual audit, (xii) the fees and expenses of the Trustee and the exchange agent and (xiii) the expenses relating to printing, word processing and distributing all Registration Statements, underwriting agreements, securities sales agreements, indentures and any other documents necessary in order to comply with this Agreement.

Indemnification by the Company and the Guarantors. The Company and the Guarantors jointly and severally agree to indemnify and hold harmless each Holder of Registrable Notes, Exchange Notes or Private Exchange Notes and each Participating Broker-Dealer selling Exchange Notes during the Applicable Period, each Person, if any, who controls each such Holder (within the meaning of Section 15 of the Securities Act or Section 20(a) of the Exchange Act) and the officers, directors and partners of each such Holder, Participating

Broker-Dealer and controlling person, to the fullest extent lawful, from and against any and all losses, claims, damages, liabilities, costs (including, without limitation, reasonable costs of preparation and reasonable attorneys’ fees as provided in this Section 8) and expenses (including, without limitation, reasonable costs and expenses incurred in connection with investigating, preparing, pursuing or defending against any of the foregoing) (collectively, “Losses”), directly or indirectly caused by, related to, based upon, arising out of or in connection with any untrue or alleged untrue statement of a material fact contained in any Registration Statement, Prospectus or form of prospectus, or in any amendment or supplement thereto, or in any preliminary prospectus, or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading, except insofar as such Losses are solely based upon information relating to such Holder or Participating Broker-Dealer and furnished in writing to the Company and the Guarantors (or reviewed and approved in writing) by such Holder or Participating Broker-Dealer or their counsel expressly for use therein; provided, however, that the Company and the Guarantors will not be liable to any Indemnified Party (as defined below) under this Section 8 to the extent Losses were solely caused by an untrue statement or omission or alleged untrue statement or omission that was contained or made in any preliminary prospectus and corrected in the Prospectus or any amendment or supplement thereto if (i) the Prospectus does not contain any other untrue statement or omission or alleged untrue statement or omission of a material fact that was the subject matter of the related proceeding, (ii) any such Losses resulted from an action, claim or suit by any Person who purchased Registrable Notes or Exchange Notes which are the subject thereof from such Indemnified Party and (iii) it is established in the related proceeding that such Indemnified Party failed to deliver or provide a copy of the Prospectus (as amended or supplemented) to such Person with or prior to the confirmation of the sale of such Registrable Notes or Exchange Notes sold to such Person if required by applicable law, unless such failure to deliver or provide a copy of the Prospectus (as amended or supplemented) was a result of noncompliance by the Company with Section 6 of this Agreement. The Company and the Guarantors also agree to indemnify underwriters, selling brokers, dealer managers and similar securities industry professionals participating in the distribution, their officers, directors, agents and employees and each Person who controls such Persons (within the meaning of Section 5 of the Securities Act or Section 20(a) of the Exchange Act) to the same extent as provided above with respect to the indemnification of the Holders or the Participating Broker-Dealer.

Indemnification by Holder. In connection with any Registration Statement, Prospectus or form of prospectus, any amendment or supplement thereto, or any preliminary prospectus in which a Holder is participating, such Holder shall furnish to the Company and the Guarantors in writing such information as the Company and the Guarantors reasonably request for use in connection with any Registration Statement, Prospectus or form of prospectus, any amendment or supplement thereto, or any preliminary prospectus and shall indemnify and hold harmless the Company, the Guarantors, their respective directors and officers and each Person, if any, who controls the Company and the Guarantors (within the meaning of Section 15 of the Securities Act and Section 20(a) of the Exchange Act), and the directors, officers and partners of such controlling persons, to the fullest extent lawful, from and against all Losses directly or indirectly caused by, related to, based upon, arising out of or in connection with any untrue or alleged untrue statement of a material fact contained in any Registration Statement, Prospectus or form of prospectus or in any amendment or supplement thereto or in any preliminary prospectus, or any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading to the extent, but only to the extent, that such losses are finally judicially determined by a court of

competent jurisdiction in a final, unappealable order to have resulted solely from an untrue statement or alleged untrue statement of a material fact or omission or alleged omission of a material fact contained in or omitted from any information so furnished in writing by such Holder to the Company and the Guarantors expressly for use therein. Notwithstanding the foregoing, in no event shall the liability of any selling Holder be greater in amount than such Holder’s Maximum Contribution Amount (as defined below).

Contribution. If the indemnification provided for in this Section 8 is unavailable to an Indemnified Party or is insufficient to hold such Indemnified Party harmless for any Losses

in respect of which this Section 8 would otherwise apply by its terms (other than by reason of exceptions provided in this Section 8), then each applicable Indemnifying Party, in lieu of indemnifying such Indemnified Party, shall have a joint and several obligation to contribute to the amount paid or payable by such Indemnified Party as a result of such Losses, in such proportion as is appropriate to reflect the relative fault of the Indemnifying Party, on the one hand, and such Indemnified Party, on the other hand, in connection with the actions, statements or omissions that resulted in such Losses as well as any other relevant equitable considerations. The relative fault of such Indemnifying Party, on the one hand, and Indemnified Party, on the other hand, shall be determined by reference to, among other things, whether any untrue or alleged untrue statement of a material fact or omission or alleged omission to state a material fact relates to information supplied by such Indemnifying Party or Indemnified Party, and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent any such statement or omission. The amount paid or payable by an Indemnified Party as a result of any Losses shall be deemed to include any legal or other fees or expenses incurred by such party in connection with any proceeding, to the extent such party would have been indemnified for such fees or expenses if the indemnification provided for in Section 8(a) or 8(b) was available to such party.

Entire Agreement. This Agreement, together with the Purchase Agreement, the Indenture and the Collateral Documents, is intended by the parties as a final and exclusive statement of

the agreement and understanding of the parties hereto in respect of the subject matter contained herein and therein and any and all prior oral or written agreements, representations, or warranties, contracts, understanding, correspondence, conversations and memoranda between the Initial Purchasers on the one hand and the Company and the Guarantors on the other, or between or among any agents, representatives, parents, subsidiaries, Affiliates, predecessors in interest or successors in interest with respect to the subject matter hereof and thereof are merged herein and replaced hereby.

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