Watts Series 77si Cast Iron Economy Strainer 1 – 1/2" (0220079) Series 77si Cast Iron, wye-pattern Strainers based on a wye-pattern screen Iron body with NPT threaded connections, stainless steel, threaded lid with non-asbestos gasket iron retainer and blow-down connection.Series 77si has machined seat which allows the screen to be self-aligning to ensure a perfect fit.Maximum pressure (non-bumping) bar: 400psi (27, 6) @ 150 F (66 C) WOG, 250psi (17.2 Bar) @ 406 F (208 C) WSP.Watts Series 77si Cast Iron Economy Strainer 1 – 1/2" (0220079) Features: of 1 /4 to 3 in. (8 to 80 mm) cast iron body wye-pattern tapped retainer cap threaded connections