This 2 - pack backflow preventer vacuum breaker is an essential addition to your water system. It comes with 2 vacuum breakers, 2 washers, and 1 long tape for easy installation. With a 3/4 - in. female hose threaded inlet and a 3/4 - in. male hose threaded outlet, it can handle a max operating pressure of 125 psi and a max temperature of 180°F/82°C. The break - off screw provides a permanent attachment, and the anti - backflow valve works well with various standard hoses and end valves. The drain hole helps remove remaining water in the pipe, but be careful when turning off the water. Made of durable brass, it meets strict industry standards. Ideal for use in hose bibs, sillcocks, RVs, garden spigots, and outside water faucets, it offers reliable protection against back - siphonage and ensures a clean water supply, bringing convenience to your daily life.