FeaturesUsed to control the on-off flow of fluid material or air. Select proper working pressure and material compatibility for application. ModelsY28-1 Inlet/Outlet NPT: 1/4" (F) Body Material: Brass Seat Material: N/A Max. Working Pressure PSI (bar): 150 (10)Y28-2 Inlet/Outlet NPT: 1/8" (F) Body Material: Brass Seat Material: N/A Max. Working Pressure PSI (bar): 150 (10)