R.E. McMahon | Backflow Prevention Testing (RPZ) & Thermostatic Mixing Valves

Established 1966

Licensed Industrial Plumbers

RPZ & TMV Certified

Confined Space & Working at Heights Certified

Projects from $100 to $5M+

Backflow Prevention

What is RPZ testing?

Reduced Pressure Zone (RPZ) assemblies prevent contaminated water from flowing back into the drinking water supply. Annual testing is a legal requirement in most commercial and industrial settings, and must be conducted by a certified tester with results lodged with the relevant water authority.

What we offer

Annual Testing & Lodgement

Our certified testers carry out your annual RPZ inspection, provide the test report, and lodge results with the relevant authority. Once your RPZ is on our database, we contact you automatically each year — you don't need to track it yourself.

Repairs & Maintenance

If your RPZ assembly fails a test or requires repair, we carry the parts and can complete the work on the same visit in many cases. We hold extensive stock across all major assembly types.

Certified Installation

New RPZ assemblies supplied and installed to the relevant Australian Standards and water authority specifications. We advise on the correct assembly for your application and install it correctly the first time.

TMV — Thermostatic Mixing Valves

Thermostatic mixing valves are now a standard requirement in aged care, medical, and childcare facilities. They prevent scalding by blending hot and cold water to a safe delivery temperature.