Industrial Interchange Pin Lock couplings designed for compressed air, gases, and liquids. Body sizes are 1/4, 3/8, 1/2 and 3/4. The original automatic one-way shutoff coupling designed by Hansen - The Industry Standard. Easy, automatic, push-to-connect design provides instantaneous connection and disconnection of lines, plus automatic shut-off of socket end of line. All sizes accept US Industrial Interchange; 1/4 and 1/2 also accept ISO 1650 Series B and A-A-59439 (former MIL-C-4109) plugs. Optional sleeve lock prevents accidental disconnection. Optional seal and valve materials available.