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Watts RK757 backflow preventer repair kit in box

Watts

Watts RK757 Backflow Preventer Repair Kit 21 757

SKU CH-6QNG-8WRSD

Repair kit restores Watts 21 and 757 backflow preventers with check disc, covers, diaphragm, lubricant, O-ring, piston seal, RV disc assembly, sleeve O-ring and upper check stem

  • Restores backflow protection with complete repair kit
  • Fits Watts 21/2 757 OSY, 3 757 OSY, 4 757 OSY assemblies
  • Includes check disc, covers, diaphragm, lubricant, O-rings, piston seal
  • Provides RV disc assembly, sleeve O-ring, upper check stem
  • New condition ensures reliable performance from installation

Compatible Backflow Repair Kit

This Watts RK757 repair kit services backflow preventers model 21 and 757 OSY across multiple sizes. It suits maintenance technicians and facility managers who need to restore proper function to existing Watts assemblies without replacing the entire valve body.

Parts Included For Complete Overhaul

The kit supplies every wearable component: check disc, covers, diaphragm, lubricant, O-ring, piston seal, RV disc assembly, sleeve O-ring and upper check stem. Each part matches the original specifications so the preventer regains its rated sealing performance after reassembly.

Verify Model Number Before Ordering

Confirm the preventer body is stamped Watts No. 21/2 757 OSY, Watts No. 3 757 OSY or Watts No. 4 757 OSY. The kit will not fit other series or brands, and no cross-reference data is provided for alternative valves.

How it compares

Measured against everything we stock in Faucet Valves & Replacement Parts, at today’s prices. Recalculated every night.

Price $139.99
Pricier than about 71% of the 1,132 comparable items (median $54.99).

Specifications

Product
Brand nameWATTS
Product typeOther

Questions about this item

Which Watts backflow preventer models does the RK757 repair kit fit?

The RK757 kit fits Watts No. 21/2 757 OSY, Watts No. 3 757 OSY and Watts No. 4 757 OSY assemblies.

What components are included to restore the preventer to working order?

The kit supplies a check disc, covers, diaphragm, lubricant, O-rings, piston seal, RV disc assembly, sleeve O-ring and upper check stem.

Does the RK757 kit contain every seal and moving part needed for a full rebuild?

Yes, it provides all listed seals, discs, the diaphragm, piston seal and upper check stem for a complete overhaul.

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