How does a pressure vacuum breaker work?

A pressure vacuum breaker uses a spring-loaded valve and an air inlet to stop contaminated water from siphoning back into your home’s main line. When your irrigation or hose system shuts off, the valve closes and the air inlet opens, creating a barrier that protects your clean water. It’s a simple but critical piece of your plumbing system. If it’s not working properly—or if it’s leaking from the top—Done can help. We’ll inspect, test, and fix the issue fast, with guaranteed workmanship and full code compliance.