This is a total small business set-aside procurement under emergency acquisition flexibilities, with a DO/DX national defense priority rating, and requires access to NOFORN and/or Naval Nuclear Propulsion information. The item is a size 12-inch hull and backup valve stem per NAVSEA drawing 7016077, designated SPECIAL EMPHASIS Level I/SUBSAFE material for a crucial shipboard system, with extensive quality, traceability, testing, welding, and configuration control requirements. The contract includes Buy American/Free Trade Agreements clauses, a one-year warranty, higher-level quality requirements, and requires an ISO-9001 (or MIL-I-45208) quality system with specified calibration standards. Performance will be at the contractor’s facility, with Government quality assurance at source and no change in place of performance without Contracting Officer authorization. Offerors must submit required certifications and quality system documentation, and must request access to drawings via SAM.gov and email the signed security agreement to the point of contact.