Originally developed for applications that could tolerate only a minimum of hydraulic fluid leakage when connecting and disconnecting. The Series 71 is a flat face coupling that does not interchange with the ISO 16028 Flat Faces. Pressure Capability – Designed for operating pressures up to 10,000 psi (690 bar). Offered in a wide range of sizes; from 1/8 to 2 inch. Optional Sleeve lock feature protects against accidental disconnection