This total small business set-aside procurement seeks a parts kit for a 3-inch combination hull and backup ball valve, consisting of one Ball (Find 3) and two mating Seats (Find 4) per NAVSEA Drawing 801-6404585, including a corrected 1.5-inch spherical radius on the Ball. The Ball material must be SAE-AMS-6931 or centrifugally cast 6AL-4V per ASTM-B367 Grade C-5, while the Seats must use MD71-GG Mearthane graphite-filled urethane manufactured by Mearthane Products Inc., Cranston, RI. The material is designated SPECIAL EMPHASIS for a crucial shipboard system, requiring extensive certification, quality system (ISO-9001 or MIL-I-45208), welding/brazing, configuration control, and Government source inspection. Classified drawings (Confidential 6404016) may require facility clearance if awarded, though access is not required to quote; the contract is anticipated as a DO-rated DPAS order under Emergency Acquisition Flexibilities. Final material delivery is required on or before 365 days after the effective date of the resulting contract, with PNSY review/acceptance of certification data taking 30 working days after receipt.