We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Watts RK909RT4 backflow preventer repair kit transparent box

Watts

Watts RK909RT4 909 Backflow Preventer Repair Kit

SKU CH-E904-CQ1RF

Repair kit for 909 backflow preventers includes check disc cover, diaphragm, lubricant, piston seal, RV disc assembly, sleeve O-ring and stem O-rings

  • ColorTransparent
  • Restores backflow protection with complete repair kit
  • Fits manufacturer number 4 909 NRS assemblies
  • Includes check disc cover and diaphragm
  • Supplies piston seal and RV disc assembly
  • Provides sleeve O-ring and check stem O-rings

Compatible Repair Kit for 909 Backflow Preventers

The Watts RK909RT4 kit is designed specifically for the 4 909 NRS backflow preventer assembly. It provides the internal components required to restore proper sealing and check-valve function during scheduled maintenance or after a failed test. The transparent colour of parts aids visual inspection before installation.

Included Components Replace Wear Items

The bundle supplies a check disc cover, diaphragm, piston seal, RV disc assembly, sleeve O-ring, and both upper and lower check stem O-rings along with lubricant. Together these parts address the common failure points that cause leakage or pressure loss. Replacing them as a set avoids piecemeal repairs and reduces repeat service calls.

Suited for Maintenance on 909 Series Valves

Plumbers and facility technicians servicing the specified 909 NRS model will find the correct fit and materials in this kit. It is not intended for other backflow preventer series or sizes, so buyers working on different assemblies should verify compatibility before purchasing.

Highlights

  • Restores backflow protection with complete repair kit
  • Fits manufacturer number 4 909 NRS assemblies
  • Includes check disc cover and diaphragm
  • Supplies piston seal and RV disc assembly
  • Provides sleeve O-ring and check stem O-rings

Specifications

ColorTransparent
BrandWATTS

Questions about this item

Which internal parts in the RK909RT4 kit will need replacing again after normal service?

The kit supplies a check disc cover, diaphragm, piston seal, RV disc assembly, sleeve O-ring and upper and lower check stem O-rings; these are the components that wear and will require future replacement.

What limits continuous operation of the repaired 909 backflow preventer?

The repaired unit is limited by the service life of the elastomer seals and diaphragm supplied in the kit; once they degrade from water chemistry or pressure cycles the preventer will need another rebuild.

Does the repair kit add any noise, heat or power draw when the 909 preventer runs all day?

No, the RK909RT4 contains only passive rubber and plastic parts plus lubricant, so it adds no noise, heat or electrical consumption during continuous operation.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.