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Watts 909 backflow preventer repair kit in sealed packaging

Watts

Watts 909-RT 3/4-1 Backflow Preventer Repair Kit

SKU CH-SVM4-GWMQ8

Repair kit for Watts LF909 backflow preventers, includes check disc, stem and cover O-rings, diaphragm, lubricant, piston O-ring and seal, RV disc assembly and sleeve O-ring, NSF lead-free compliant

  • Repair kit restores backflow preventer function
  • Includes check disc, stem O-ring, cover O-ring
  • Contains diaphragm, lubricant, piston O-ring and seal
  • Supplies RV disc assembly and sleeve O-ring
  • NSF lead-free compliant for potable water systems

Watts 909-RT Repair Kit

The Watts 909-RT kit restores LF909 series backflow preventers in 3/4 to 1 inch sizes. It targets plumbers and facility managers maintaining potable water systems. The package supplies every seal and moving part needed for a complete rebuild.

NSF Lead Free Compliance

All included components meet NSF lead free requirements for drinking water safety. The kit contains check discs, O-rings, a diaphragm, piston seals, an RV disc assembly and lubricant. No additional parts are required to return the valve to service.

Complete Component Set

The bundled lubricant eases installation and protects elastomers during assembly. Each O-ring and seal matches original dimensions so the preventer reseals without modification. The kit covers the full internal mechanism in one package.

How it compares

Measured against everything we stock in Bath Accessories & Soap Dispensers, at today’s prices. Recalculated every night.

Price $103.99
Pricier than about 74% of the 1,499 comparable items (median $39.99).

Specifications

Product
Brand nameWATTS
Product typeOther

Questions about this item

How do I install the Watts 909-RT repair kit and which step is most often missed?

Shut off water, relieve pressure, remove the cover, replace the diaphragm, check disc, RV disc assembly, all O-rings and piston seal, then apply the included lubricant to every seal before reassembly — skipping lubrication causes early leaks

What parts in this kit will need replacement again during future servicing?

The diaphragm, check disc, RV disc assembly, piston seal and every O-ring (check stem, cover, piston, sleeve) are wear items that degrade with each pressure cycle and must be swapped at the next rebuild

What is the first limit reached when the rebuilt preventer runs under sustained pressure?

The elastomer seals and diaphragm lose elasticity first, so seat leakage appears before any metal component wears out

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