Watts 0887172 Repair Kit

The Watts 0887172 Repair Kit (also identified as RK188A/288A/388T) is a field-essential service solution for 3/4" and 1" anti-siphon vacuum breakers. Engineered for high-performance in both commercial and industrial potable water systems, this kit addresses common failure points caused by mineral deposits and seal fatigue. As a veteran-grade backflow preventer repair kit, it is compatible with Watts 188A, 288A, and 388T series, as well as lead-free LF288A models. The package includes a high-durability disc assembly—comprising the disc and disc float—and a precision-molded bonnet O-ring. Replacing these internal components is the standard protocol for resolving continuous dripping or venting issues caused by a fouled first check or sticking float. Designed for rapid field service, this 0887172 total repair kit requires no specialized tools, ensuring you can restore system integrity and prevent backsiphonage in hot or cold water systems without a full valve replacement.

• Universal Series Compatibility: Fits 3/4-inch and 1-inch Watts 188A, 288A, and 388T series, providing a versatile solution for multiple backflow preventer configurations.
• Complete Restoration: Includes the full disc assembly and bonnet O-ring to eliminate leaks and maintain the critical air gap required for atmospheric vacuum breakers.
• Lead-Free Construction: Complies with all safe drinking water standards for use in potable water applications.
• Optimized Flow: Restores the original orifice capacity and flow characteristics to prevent localized pressure drops.
• Simplified Service: Direct factory replacement components designed for immediate installation to minimize system downtime.

Will this kit work for both the 3/4" and 1" valve sizes?
Yes, the Watts 0887172 is engineered as a shared component kit for the 3/4-inch and 1-inch 188/288/388 series valves, as these sizes utilize the same internal diameter for the disc and float assembly.

What is the primary cause of the vacuum breaker dripping from the vent?
In most cases, debris or scale buildup on the seat or disc prevents a tight seal. Replacing the disc assembly with this kit restores the mechanical shut-off required to prevent venting during normal operation.

Does this kit include the bonnet itself or just the O-ring?
This is a total repair kit for internal components; it includes the O-ring for the bonnet and the moving disc assembly, but the cast bonnet housing must be reused if it is in good structural condition.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.