This 3/4 in brass hose connection vacuum breaker 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 back siphonage for health hazard installations requiring non-continuous pressure. This vacuum breaker has a freeze relief feature that protects the valve from freeze damage. It attaches to a sill cock with a 3/4 in female hose thread by 3/4 in male hose thread connection. The maximum pressure is 125 psi and maximum temperature is 180 deg F.