MARSHALL EXCELSIOR High Pressure Hose. Quick Disconnect Hose Assemblies are designed to connect to the propane supply on a RV or trailer that has a built-in Quick Connect propane connection. The Quick Disconnect eliminates the need for tools and wrenches. Simply push to connect, and pull to disconnect. HP hose 1/4in ID, QD x 1/4in MNPT without cap, 72in long.