This 3/4 inch lead free hose connection vacuum breaker backflow preventer is designed to prevent the flow of contaminated water back into the potable water supply and is specially made to permit the attachment of portable hoses to hose thread faucets. It provides protection against backsiphonage for health hazard installations requiring non-continuous pressure. This vacuum breaker backflow preventer has a freeze relief feature that protects the valve from freeze damage. It attaches to a sill cock with a 3/4 inch female hose thread by 3/4 inch male hose thread connection. The maximum pressure is 125 psi and maximum temperature is 180 degrees F.