The part AP-6739 is a genuine OEM valve sleeve (also called a Buna rubber sleeve) used in the check-valve assembly of WaterJet Cutting Machines to Seal and guide the Valve Stem and prevent high-pressure fluid leakage. Machined from Buna-N (nitrile) elastomer, it provides excellent resistance to hydraulic oils and abrasives, ensuring reliable valve operation under 60 000 psi service conditions.

Specifications
Material:Buna-N (nitrile rubber)
Temperature Range:−30 °C to +100 °C (typical Buna-N service)
Pressure Rating:Up to 60 000 psi (4 100 bar) (when installed in OEM valve housing)
Dimensions:OEM proprietary (fits valve housing bore ~14 mm or 23.5 mm per SKU)
Quantity per Valve:1 sleeve per check-valve assembly