Watts 0881335 First and Second Valve Rubber Parts Kit

The Watts 0881335 First and Second Valve Rubber Parts Kit is a field-serviceable repair kit for 4-inch Watts backflow preventer assemblies, replacing the rubber components in both the first and second check valves to restore sealing performance and reliable operation. This OEM Watts part (MPN 0881335, Kit No. 30 BFP-RK) enables preventive maintenance and corrective repairs across commercial, industrial, municipal, and institutional water systems, and is commonly installed in municipal water systems, fire protection service lines, commercial plumbing systems, irrigation networks, industrial facilities, and large water distribution systems utilizing Watts backflow preventers. The kit supports maintenance programs and annual testing, valve overhauls, and compliance upgrades, helping prevent backflow conditions that could compromise potable water quality. It is field-installable with potable water service and compatible with Watts backflow preventer assemblies, serving as an essential component in backflow prevention system restoration. Common replacements associated with this kit include Watts RK 709 RT 4" Rubber Parts Kit, Watts RK 709 CK4 4" Check Valve Repair Kit, and Watts RK LF709 RT 4" Lead-Free Rubber Parts Kit.