FeaturesUsed to control the on-off flow of fluid material or air. Select proper working pressure and material compatibility for application. Models104077-2 Inlet/Outlet NPT: 1/4" (F) Body Material: Nickel-plated brass Seat Material: PTFE Max. Working Pressure PSI (bar): 225 (16)104077-3 Inlet/Outlet NPT: 3/8" (F) Body Material: Nickel-plated brass Seat Material: PTFE Max. Working Pressure PSI (bar): 225 (16)104077-4 Inlet/Outlet NPT: 1/2" (F) Body Material: Nickel-plated brass Seat Material: PTFE Max. Working Pressure PSI (bar): 225 (16)