Series 77SI Cast Iron, Wye-Pattern Strainers feature a wye-pattern, iron body with NPT threaded connections, stainless steel screen, threaded iron retainer cap with non-asbestos gasket and blow-down connection. Series 77SI has machined seat that allows the screen to be self-aligning to assure a perfect fit. Maximum Pressure (non shock): 400psi (27.6 bar) at 150 deg F (66 deg C) WOG, 250psi (17.2 bar) at 406 deg F (208 deg C) WSP.