Official-data repair desk
Backflow preventer repair kits.
By model and size.
Match the complete manufacturer and model label, nominal body size, and confirmed repair scope to an official part reference before you order.
Repair kits are not universal. This is a compatibility index, not a remote diagnosis or a retailer catalog.
Read the complete body label. Do not identify a kit from appearance alone.
Bonnet kit
Bonnet, O-ring, spring, E-ring, washer, and stem.
Bonnet/poppet kit
Bonnet hardware plus rubber disc and poppet.
Check kit
Holder, disc, guide, and screw.
Complete rubber parts kit
O-ring, rubber disc, and check disc.
Bonnet kit
Bonnet, O-ring, spring, E-ring, washer, and stem.
Bonnet/poppet kit
Bonnet hardware plus rubber disc and poppet.
Check kit
Holder, disc, guide, and screw.
Complete rubber parts kit
O-ring, rubber disc, and check disc.
Bonnet kit
Bonnet, O-ring, spring, E-ring, washer, and stem.
Check kit
Holder, disc, guide, and screw.
Complete rubber parts kit
O-ring, rubber disc, and check disc.
Check valve seat and ring kit
Seat ring and O-ring.
Complete rubber parts kit
Published rubber service components for the applicable 825Y assembly.
Check valve seat and ring kit
Seat ring and O-ring.
Complete rubber parts kit
All silicone rubber parts necessary for the applicable 825Y valve service path.
860 inlet check replacement kit
Published inlet-check replacement components from the FEBCO 860 maintenance table.
860 rubber parts kit (checks and relief valve)
Published check and relief-valve rubber service components.
860 inlet check replacement kit
Published inlet-check replacement components from the maintenance table.
860 rubber parts kit (checks and relief valve)
Published check and relief-valve rubber service components.
860 inlet check replacement kit
Published inlet-check replacement components from the maintenance table.
860 rubber parts kit (checks and relief valve)
Published check and relief-valve rubber service components.
860 inlet check replacement kit
Published inlet-check replacement components from the maintenance table.
860 rubber parts kit (checks and relief valve)
Published check and relief-valve rubber service components.
860 relief valve repair kit
Published relief-valve service components including diaphragm, disc, piston, seat, O-rings, and related hardware.
First check kit
First check assembly and cover O-ring.
Cover repair kit
Cover and cover O-ring.
Relief-valve rubber parts kit
Diaphragm, disc assembly, stem O-rings, seat O-ring, and cover O-ring.
Cover repair kit
Cover and cover O-ring.
Total relief valve kit
Seat, seat O-ring, stem and diaphragm assembly, stem O-ring, cover O-ring, and relief-valve spring.
Cover repair kit
Cover, cover O-ring, sensing passage O-ring, bleed screw O-ring, vent hood, and bleed screw.
First check kit
First check assembly, cover O-ring, and sensing passage O-ring.
Cover repair kit
Cover, cover O-ring, sensing passage O-ring, bleed screw O-ring, vent hood, and bleed screw.
First check kit
First check assembly, cover O-ring, and sensing passage O-ring.
Total repair kit
Check, vent-float, bonnet, and seat repair-kit groups.
Bonnet kit
Bonnet, bonnet O-ring, vent spring, hood, and hood screw.
Check kit
Check disc assembly, bonnet O-ring, and check spring.
Rubber parts kit
Vent seal, check disc, and bonnet O-ring.
Total repair kit
Check, vent-float, bonnet, and seat repair-kit groups.
Bonnet kit
Bonnet, bonnet O-ring, vent spring, hood, and hood screw.
Check kit
Check disc assembly, bonnet O-ring, and check spring.
Vent float kit
Float vent disc assembly and bonnet O-ring.
Total repair kit
Check, vent-float, bonnet, and seat repair-kit groups.
Bonnet kit
Bonnet, bonnet O-ring, vent spring, hood, and hood screw.
Check kit
Check disc assembly, bonnet O-ring, and check spring.
Rubber parts kit
Vent seal, check disc, and bonnet O-ring.
Total repair kit
First and second check-valve assemblies, relief-valve assembly, and lubricant.
Total rubber parts repair kit
Diaphragm, molded disc assemblies, seat O-rings, relief-valve and piston O-rings, flow-tube O-ring, cover O-ring, and lubricant.
Relief-valve rubber parts kit
Diaphragm, disc assembly, seat O-ring, relief-valve O-ring, piston O-rings, and lubricant.
First check repair kit
Disc assembly, seat, seat O-ring, sleeve, check spring, PC cover, and cover O-ring.
Cover repair kit
Cover, cover O-ring, and lubricant.
Check rubber parts repair kit
Bronze disc assembly, seat O-ring, cover O-ring, and lubricant.
Complete relief-valve repair kit
Published relief-valve rubber and service components including diaphragm, seal rings, relief spring, and related O-rings.
Relief-valve rubber repair kit
Published rubber service components for the relief-valve assembly.
Relief-valve complete internals kit
Upper and lower plunger, diaphragm, seals, seat, retainer, washer, bolt, and relief-valve spring in the published component matrix.
Relief-valve cover repair kit
Relief-valve cover and published cover hardware.
Relief-valve plunger repair kit
Published upper and lower plunger service components.
Complete relief-valve repair kit
Published relief-valve rubber and service components for the 8 and 10 inch size band.
Relief-valve rubber repair kit
Published rubber service components for the large 8 and 10 inch relief-valve assembly.
Relief-valve complete internals kit
Published upper and lower plunger, diaphragm, seals, seat, retainer, washer, bolt, and relief-valve spring components.
Relief-valve cover repair kit
Relief-valve cover and published cover hardware.
Complete repair kit
Bonnet washer and O-ring, load nut and guide, load washer, upper disc, poppet, spring, spider screw, lower disc, guide spider, and hex nut.
Repair Pro-Kit
Bonnet O-ring, load nut and guide, load washer, upper disc, and poppet.
Bonnet repair kit
Canopy screws, canopy, bonnet, bonnet washer, and bonnet O-ring.
Complete repair kit
Bonnet washer and O-ring, load nut and guide, load washer, upper disc, poppet, spring, spider screw, lower disc, guide spider, and hex nut.
Bonnet repair kit
Canopy, bonnet, bonnet washer, bonnet O-ring, and related canopy hardware listed in the manufacturer repair-kit guide.
Standard repair kit
Two cover O-rings, two check springs, and two seal rings.
Complete repair kit
Two cover O-rings, check springs, poppets, seal rings, retainers, retaining bolts, check seats, and check-seat O-rings.
Rubber repair kit
Published cover O-rings and seal rings for the applicable 950XL band.
Repair kit with seats
Published check-seat service components for the 3/4 and 1 inch band.
Check-cover repair kit
Two check covers and published cover O-rings.
Standard repair kit
Two cover O-rings, two check springs, and two seal rings.
Complete repair kit
Two cover O-rings, check springs, poppets, seal rings, retainers, retaining bolts, check seats, and check-seat O-rings.
Rubber repair kit
Published cover O-rings and seal rings for the applicable 950XL band.
Repair kit with seats
Published check-seat service components for the 1 1/4 through 2 inch band.
Check-cover repair kit
Two check covers and published cover O-rings.
Total repair kit
Check and relief-valve service components listed in the official parts breakdown.
Complete internal kit
Poppets, springs, seats, seals, and related O-rings shown by Zurn.
Rubber repair kit
Published rubber sealing components for the model family.
Total repair kit
Check and relief-valve internal components for the 3/4 and 1 inch band.
Complete internal kit
Poppets, springs, seats, seals, and O-rings in the official component matrix.
Rubber repair kit
Rubber seals and O-rings identified in the official repair-parts guide.
Seat repair kit
Published check and relief-valve seat service components.
Total repair kit
Check and relief-valve internal components for the 1 1/4 through 2 inch band.
Complete internal kit
Poppets, springs, seats, seals, and O-rings in the official component matrix.
Rubber repair kit
Rubber sealing components identified by Zurn for this size band.
Visible compatibility index
Backflow preventer repair kits by model and size.
Each model passport exposes the published size bands, repair scopes, manufacturer part references, compatibility boundaries, and official sources.
Compatibility rules
How to match a backflow preventer repair kit.
A kit is only a candidate after the assembly and failed service zone are confirmed.
- Manufacturer and exact model: 975XL, 975XL2, and 975XL3 are not interchangeable names.
- Nominal body size: part-number prefixes and internal components can change at a size-band boundary.
- Repair scope: check, relief, rubber, seat, cover, and total-service kits contain different parts.
- Official source: confirm supersession and current availability in the cited manufacturer record.
- Return to service: include qualified repair, a required retest, and utility report closeout in the job.
Repair-kit FAQ
What the part number does not prove.
- Are repair kits universal? No. Visual similarity and pipe size alone do not establish compatibility.
- Does a kit identify the failed component? No. Use the failed test, observed location, and qualified diagnosis to define scope.
- Is the job complete after installation? Not always. Regulated assemblies may require a passing retest and accepted report.