The Series 77SI Threaded, Wye-Pattern, Cast Iron Strainers are manufactured overseas. These strainers are designed to protect system components from dirt, rust, and other damaging debris in the piping system. Series 77SI strainers are used in steam and liquid applications. They are furnished with a machined seat that allows the screen to be self-aligning to assure a perfect fit. All sizes come with a PTFE gasket, threaded screen retainer cap, tapped blowdown connection, and an easily removable stainless steel screen.