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Backflow Prevention


Steel, Flanged, Wye-Pattern Strainers

Lead Free* Models Available


1/2 to 6 in. (15 to 150mm)


Series 77F-CSI Steel, Flanged, Wye-Pattern Strainers feature a wye-pattern, cast steel body with flanged connections, stainless steel screen, cast steel retainer cap with PTFE gasket and blow-down connection. Series 77F-CSI has a machined seat that allows the seat to be self-aligning and assures a perfect fit. The strainer may be installed in horizontal or vertical pipe with the blow-down connection at the lower end of the screen retainer cover. Maximum Pressure (non-shock): 285psi (19.6 bar) @ 100°F (38°C) WOG, 150psi (10.3 bar) @ 400°F (204°C) WSP.

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Disclaimer: Watts product dimensions in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.

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*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

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