Two port screw-in cartridge valves that are designed to fit in a cavity confirming to ISO 7789 : 1998 (E). These are seat type vales, available in four different sizes and with five different cracking pressure in each size. Check valves allow free flow in one direction while providing leak-free closure in reverse direction. Features Fits into ISO 7789 : 1998 (E) cavity. (other cavities available on request) Cartridge construction for compact integrated manifolds Economical Quick and Easy field service, reduces down time Valve Bodies available on request