Watts Series 77SI
Wye-Pattern Cast Iron Threaded Strainers
Sizes: 1/4" – 3" (8-80mm)
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.
• Cast iron body
• Tapped retainer cap
• Threaded connections
Pressure – Temperature
Maximum Working Pressure:
400psi (27.6 bar) at 150ºF (66ºC) WOG
250psi (17.2 bar) at 406ºF (208ºC) WSP