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Febco three-quarter inch Pressure Vacuum Breaker with attached union ball valves. The unions allow you to easily remove the PVB for winter storage. This vacuum breaker provides protection against water back-siphonage and contamination. The irrigation main will remain pressurized at all times. If pressure is lost inside the house, the valve will prevent lawn water from entering your house water lines. Used for irrigation and commercial applications. Made of durable bronze construction.