Device identification

Backflow preventer types: identify the family before you search for a fix

A device-family decision page covering why RPZ, double-check, vacuum-breaker, and other assemblies should be identified from the actual label and use case.

Working verdict

Device type identification should begin with the manufacturer label, model, size, and application. A family name is useful for routing but does not prove part compatibility or compliance status.

FIELD VIEW Use the shape as a clue. Confirm the model label before service.

Before you act

Escalate uncertain identity, active discharge, a failed test, or a proposed replacement before using a generic category.

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.

Which family is actually installed and what does that identification unlock?

Evidence sequence

Move in this order

01
Establish the governing record
Capture the whole assembly and all visible markings.
02
Define the complete work
Match the record to manufacturer documentation and actual system use.
03
Document completion
Route to the relevant test, repair, or installation requirement.

Identification notes

What to look for

Label and nominal size are stronger evidence than visual similarity.
System use helps route the next question but does not replace the label.
Different device families have different service, installation, and test paths.

Safe observations

What you can check without taking it apart

Use the exact property and assembly record before authorizing work.
Confirm official program and manufacturer information for the decision.
Keep the final result and submission evidence together.

Stop conditions

Move to qualified help when

The model cannot be confirmed before parts are selected.
A generic category is being used to approve replacement.

Get help with this next step

Boundary check

Do not confuse this path with

A pressure regulator controls pressure and is a different product category.
A sewer backwater valve is not a potable-water backflow assembly.
A generic check valve does not establish a testable backflow preventer type.

Official local layer

Your utility sets the rule

This path is governed by the official utility or authority requirement, then by exact manufacturer documentation for the identified assembly.

Find the utility named on the notice

Verified utility matches: 96

Evidence ledger

What this decision path is built on

This path is governed by the official utility or authority requirement, then by exact manufacturer documentation for the identified assembly.

01
U.S. EPA · EPA-CCC-001Cross-Connection Control ManualBackflow, backsiphonage, device families, hazard protection, testing, and program responsibility. Verified 2026-08-02.
02
Watts · WATTS-RPZ-009Series 009 reduced pressure zone assemblyRPZ construction, relief discharge, installation constraints, service literature, and local-code warning. Verified 2026-08-02.
03
USC 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.
04
USC Foundation for Cross-Connection Control and Hydraulic Research · USC-DEVICE-GUIDE-2026Cross-connection control introduction and assembly descriptionsAssembly descriptions and the requirement to check the local administrative authority for acceptable use; supports device-family comparison and fire-system distinction. Verified 2026-08-02.

Continue the case

Related next steps

CONTENT REVIEWED · 2026-08-02