Backflow Preventers & Vacuum Breakers

Backflow preventers and vacuum breakers protect potable water by stopping reverse flow caused by back-siphonage or backpressure. Whether feeding irrigation zones, boiler make‑up lines, fire sprinklers, commercial kitchens, labs, or hose bibbs, these devices keep contaminants out and help you meet plumbing code and inspection requirements. A properly selected and tested device reduces liability, keeps operations running, and builds confidence that every tap stays safe. This category supports cross‑connection control programs for residential, commercial, and industrial systems.

Common options include:
- RPZ (reduced pressure zone) assemblies for high‑hazard cross‑connections; require a drainable relief zone and freeze protection.
- Double check valve assemblies (DCVA) for low‑hazard applications with backpressure risk.
- Pressure vacuum breakers (PVB) and atmospheric vacuum breakers (AVB) for irrigation and fixture protection against back‑siphonage.
- Anti‑siphon hose bibb vacuum breakers for outdoor spigots and service sinks.

Choose by hazard level, line size (1/2 in. to 10 in.+), flow and allowable pressure loss, installation orientation, and local code. Materials include lead‑free brass/bronze, stainless steel, and PVC. Look for ASSE, CSA, and NSF/ANSI 61/372 listings and USC approvals to satisfy inspectors and protect drinking water. Helpful features include integral shutoff valves, test cocks for certified testing, union ends for quick swap‑outs, strainers to catch debris, freeze‑resistant designs, and tamper‑resistant caps.

Installation and maintenance tips:
- Place PVB/AVB above downstream piping; follow height and clearance guidelines.
- Provide drainage for RPZ relief discharge and avoid locations prone to flooding.
- In cold climates, insulate or remove and drain irrigation units before freezing temperatures.
- Plan annual testing by a certified tester; keep records for compliance and warranty.
- Use OEM repair kits (check springs, diaphragms, relief valves) to restore performance and reduce downtime.

Browse RPZ, DCVA, PVB, AVB, hose bibb vacuum breakers, repair kits, and backflow test kits to match your project. With the right device, you protect water quality, pass inspections, and minimize downtime while optimizing system reliability and code compliance.