Watts 888143 Complete Rubber Kit 919 Backflow Preventer

Product Description

The WATTS 888143 is a complete rubber repair kit designed for the WATTS 919 series reduced-pressure zone (RPZ) backflow preventer in 1.25-inch and 1.5-inch sizes. This kit supplies all internal rubber components needed to restore a 919 unit to proper operating condition without replacing the entire valve body. RPZ backflow preventers are critical safety devices that protect potable water supplies from contamination caused by back-siphonage or backpressure. Plumbers and backflow technicians use kits like this during annual testing cycles or whenever an inspection reveals worn, swollen, or damaged internal rubber parts.

This kit is suited for use in commercial and light-industrial plumbing applications where the WATTS 919 backflow preventer is installed on 1.25-inch or 1.5-inch pipe runs. Typical installation scenarios include irrigation systems, fire suppression supply lines, boiler make-up water connections, and general mechanical room piping. Replacing rubber internals at regular service intervals keeps the device in compliance with local cross-connection control ordinances and ASSE 1013 performance standards.

Key Features

• Includes all rubber components required for a complete rebuild of the 919 RPZ valve
• Fits 1.25-inch and 1.5-inch WATTS 919 series backflow preventers
• Restores proper check valve and relief valve seating for continued backflow protection
• Lightweight at 0.47 pounds, making it easy to carry on service calls
• OEM-matched rubber parts help maintain manufacturer performance specifications

Compatibility

Designed as a replacement rubber kit for the WATTS 919 series reduced-pressure zone backflow preventer in 1.25-inch and 1.5-inch configurations.

Installation Notes

Installation and rebuild of RPZ backflow preventers should be performed by a licensed plumber or a certified backflow assembly tester in accordance with local plumbing codes and IPC requirements. Shut off the upstream isolation valve and relieve system pressure before disassembling the backflow preventer. Inspect all seating surfaces for scoring or corrosion before installing new rubber components. After reassembly, the device must be tested with a differential pressure gauge kit to confirm proper check valve and relief valve operation before returning the system to service.

Technical Specifications

• Fits Valve Series: WATTS 919
• Applicable Sizes: 1.25 inches and 1.5 inches
• Weight: 0.47 pounds

Standard Information

• Brand: WATTS
• Manufacturer Part Number: 888143