The PWS series is a free flow valves coupling that has been designed for use in applications such as jet washing systems. it is not recommended for use with corrosive fluids as when disconnected will allow fluid in the hose to flow out.
The PWS coupling is available in 3/8″ only in BSP thread form and is made from a 316/304 stainless steel misture (AISI 316 body/304 locking balls).