An assembly fails when one of its parts stops doing its job: a check valve that won’t hold, a relief valve that won’t open on time, an air inlet stuck shut, or a shutoff valve that leaks so badly the test can’t be run. Under Washington rules, a repaired assembly must be retested before it’s considered back in service — and some utilities set tight deadlines. Kirkland, for example, gives you five business days.
The failures we see most
| Symptom | Usual cause | Usual fix |
|---|---|---|
| RP relief valve dripping or “spitting” | Debris on the #1 check seat, or a worn #1 check disc | Clean seat, replace rubber parts |
| Check valve won’t hold 1.0 psid | Grit, pipe scale or hardened rubber | Clean, replace disc / seat kit |
| PVB leaking from the bonnet | Freeze damage or a worn poppet | Bonnet/poppet kit — or replacement if the body cracked |
| Can’t run the test at all | #2 shutoff valve won’t close tight | Shutoff repair or replacement |
| Test cock won’t open / leaks | Corrosion | Replace test cock |
How a repair visit works
- We record the failing reading — that goes on the report too.
- We explain exactly what failed and quote parts and labor before touching anything.
- We rebuild with the manufacturer’s repair kit for your make and model. We stock kits for the brands common around Puget Sound — Watts, Febco, Wilkins/Zurn, Ames and Apollo/Conbraco.
- We retest. When it passes, the full report (initial fail, repair, passing retest) is filed with your utility.
Repair or replace?
Repair almost always wins on cost. Replacement makes sense when the body is cracked (common with frozen PVBs), the model is no longer approved and parts are unavailable, or the assembly is the wrong type for the hazard. Replacement is installation work that may need a permit and, inside a building, a licensed plumber — we’ll tell you exactly what’s involved and coordinate it.
Licensing matters here. In Washington, not just anyone can repair an assembly. Work outside a building requires a registered contractor; work inside a building requires an L&I plumbing certificate (journey-level, residential, or the PL30 backflow specialty). We only perform repairs we’re licensed to do, and we’ll tell you up front if a job needs a plumber.
