This Navy procurement is for a size 4-inch hull and backup valve stem per NAVSHIPS drawing 845-4558766, item 21A, made from QQ-N-286 form 2 cold-drawn, annealed and age-hardened material, with no weld repair permitted. The stem is special-emphasis Level I shipboard material, requiring rigorous quality, traceability, certification, configuration-control, and Government source-inspection requirements, including an ISO 9001-based quality system and calibration controls; Portsmouth Naval Shipyard is referenced for certification review/acceptance and delivery is FOB destination. The schedule requires certification CDRLs 20 days before scheduled delivery, PNSY review/acceptance within 6 working days after receipt, and final material delivery within 365 days after the resulting contract’s effective date. The order is a total small business set-aside, will be a DO-rated DPAS order certified for national defense use, and is issued under Emergency Acquisition Flexibilities; past performance will be considered in evaluation. If drawings are included, access must be requested through the notice page and the primary POC notified, and the contractor must comply with waiver/deviation, CDRL, mercury-free, and related quality requirements.