Parts identification
Backflow preventer repair kit: match the exact model and size first
A repair kit is only valid when manufacturer, model, nominal size, and failed component are known.
A repair kit is only valid when manufacturer, model, nominal size, and failed component are known. Similar-looking assemblies can use different internal parts and service procedures.
Do not order a generic or universal kit from a photo. Escalate missing labels, obsolete products, body damage, and uncertain part compatibility.
Interactive check
Turn observations into a next step
This narrows the route. It does not replace an on-site test, manufacturer instructions, or local requirements.
Evidence sequence
Move in this order
- 01
Observe and identify
Capture the full label and each serviceable section before searching parts.
- 02
Match the verified path
Use the manufacturer path or model passport to match exact part scope and size.
- 03
Close the risk loop
Include qualified installation and a required post-repair test in the final plan.
Identification notes
What to look for
- The model label and nominal size are the primary compatibility keys.
- A check kit, relief kit, cover kit, and complete service kit are not interchangeable scopes.
- A kit does not include isolation, labor, retest, or required report filing.
Safe observations
What you can check without taking it apart
- Keep original part numbers and removed-part notes with the asset record.
- Confirm whether parts are official or approved replacements.
- Verify return and restocking terms before ordering uncertain parts.
Stop conditions
Move to qualified help when
- No exact model and size can be confirmed.
- The body, shutoff, or connected piping is damaged.
Boundary check
Do not confuse this path with
- A product-family name alone does not establish component compatibility.
- A generic online part listing is not a repair diagnosis.
- This page does not replace a qualified on-site assessment.
Official local layer
Your utility sets the rule
Use exact manufacturer literature and the governing utility or authority record to validate the device, service path, and compliance closeout.
Evidence ledger
What this decision path is built on
Use exact manufacturer literature and the governing utility or authority record to validate the device, service path, and compliance closeout.
- 01U.S. EPA · EPA-CCC-001Cross-Connection Control ManualBackflow, backsiphonage, device families, hazard protection, testing, and program responsibility. Verified 2026-08-02.
- 02Watts · WATTS-RPZ-009Series 009 reduced pressure zone assemblyRPZ construction, relief discharge, installation constraints, service literature, and local-code warning. Verified 2026-08-02.
- 03USC Foundation for Cross-Connection Control and Hydraulic Research · USC-APPROVAL-LIST-2026List of Approved Backflow Prevention AssembliesCurrent approval-list guidance: exact assembly type, manufacturer, model, size, manual edition, orientation, and approved replacement shutoff compatibility must be verified. Verified 2026-08-02.
Continue the case
Related next steps
CONTENT REVIEWED · 2026-08-02