This is the standard industrial quick disconnect used by carpet cleaners.

This is the standard industrial quick disconnect used by carpet cleaners. 1/4" female pipe threads and conforms with ISO Standard 7241-1, Series B (brass). Shut-off valves on the nipple and coupler. Super Pressure and fluidness The material is Brass Rated at a working pressure of 4,600 psi. Temperature Range: -40° to 225° F. Body Size: 1/2", Thread Size:1/2"NPT