0887974 (Watts) | 3/4 - 1 Inch | 008 Svb Check Repair KitThis 3 4 1 IN Backflow Preventer Check Repair Kit, Series 008, is Used to Prevent The Reverse Flow of Polluted Water From Entering Into The Potable Water Supply Due to Backsiphonage on Indoor Point Of Use Applications. It Consists of a Check Assembly, O Ring, Spring, Vent O Ring And a Bleed Screw O Ring And Retainer. It is Ideal For Indoor Use on Machines or Equipment in General Plumbing Applications. Watts 0887974