This hydraulic quick coupler connects and disconnects hydraulic lines under pressure without tools, allowing implement changes without significant fluid loss. It is installed at the coupling point between the tractor’s auxiliary circuit and the implement hose, where its internal poppet valve seals the line when uncoupled. A worn or leaking coupler causes slow implement response and visible oil seepage at the connection point. The original manufacturer’s seal geometry matches the mating half’s bore and valve seat, ensuring the connection holds full system pressure without bypass. On reinstallation, ensure the coupler is fully seated and the locking collar clicks into place.