This quick coupler socket is the female half of a hydraulic-line connection, machined with an M22 thread and a 1.5 mm pitch. It mounts at the hydraulic system interface on the host tractor or self-propelled machine, accepting the male coupler plug to establish a sealed fluid path. The socket’s internal seal and locking mechanism hold the connection under operating pressure; a worn or damaged socket will cause fluid leakage at the coupling point and a loss of system pressure. As an original manufacturer component, the socket is machined to match the seal groove depth and thread tolerance of the original hydraulic block, so the coupler seats fully without shimming or adapter rings. On replacement, ensure the mating surfaces are clean and the O-ring is replaced before torquing the socket into the port.