Mueller Optics 10-in L x 1/2-in Copper Sweat Brass Anti-Siphon Multi Turn Sillcock

Prevents outside faucet freezing and protects against back siphoning. Built-in backflow preventer checks siphoning back into the water supply. The sill cock drains automatically upon water shut-off if the hose is removed or open. 1/2-in nominal copper sweat or 1/2-in MIP. Manufacturer part number 477508.