‘Me’ quick release coupling is widely used for air & hydraulic fluid application. The sizes are: 1/4" to 2" bsp/nptf thread male or female. It comes with through bore, single shut-off & double shut-off valves for the ease of application and to avoid leakage. Precise machining on cnc ensures interchangeability with coupler & adaptor.The standard are iso 7241-1 series b & a they are equivalent to nitto,hansen etc