The 596 Series of Two Way Check (Shuttle) Valve is manufactured with a heavy-duty corrosion-resistant iron housing. It is equipped with a total of three ports, two inlets and one outlet. This porting allows for quick change-over from desired inlet conditions to the outlet valve side. The check aspect assures that only the desired inlet signal is transmitted to the outlet port. The 596 has 3/8" NPT ports. It is enhanced with our in-line cartridge design that eliminates the need to break any pipe connections resulting in a significant reduction in costly out-of-service time during maintenance. The check valve cartridge is designed with or without a spring at customer request and a stainless steel shuttle that seals on an o-ring to eliminate compressed air leakage. Several configurations with orifices are available and marked for quick reference. In addition, the GW 5998-050 Series Orifice Adapter can be used with the 998 style check valve to control flow and eliminate the need for a second in-line check valve.