A commercial item solicitation is issued as a Request for Quotation, restricted to responsible sources, with a firm-fixed-price purchase order anticipated on a sole source basis to RTX Corporation DBA Pratt & Whitney. The requirement is for two each of a Valve, Modulating (NSN 2840-01-551-4791, P/N 4952829). Offerors must have the technical expertise and OEM parts to perform the required repairs; a Certificate of Conformance is required, and no drawings, specifications, or schematics are available from the USCG. Only quotations with shipping terms of F.O.B. Destination or F.O.B. Origin will be accepted (Ex Works and other Incoterms are not allowed). Interested parties should review the solicitation attachments for terms, conditions, and instructions to offerors.