single shut-off coupling (SSC) is designed with self-sealing valving to prevent fluid leakage when disconnected from the fluid system. The SSC provides one-side sealing of fluid when disconnected. Used in aircraft hydraulic systems and located at the interface of the engine-driven pump or similar equipment, the SSC is installed on the flexible hose assembly and threads on to an industry standard fitting at the pump, SAE AS4375, AS33514 or bulkhead fitting equivalents.