FeaturesUsed to control the on-off flow of fluid material or air. Select proper working pressure and material compatibility for application. Models636042 Inlet/Outlet NPT: 1/2" (F) Body Material: Carbon Steel Seat Material: Leather Max. Working Pressure PSI (bar): 8,000 (552) 636043 Inlet/Outlet NPT: 1/2" (M) x 1/2" (F) Body Material: Carbon Steel Seat Material: Leather Max. Working Pressure PSI (bar): 8,000 (552) 92818 Inlet/Outlet NPT: 1/4" (F) x 1/4" (M) Body Material: Brass Seat Material: Leather Max. Working Pressure PSI (bar): 125 (9)