SharkBite 1/2 in. PTC MHT Anti-Siphon Brass Sillcock

1/2 in. x 3/4 in. x 18 in. SharkBite Frost-Free Anti Siphon Sillcock is the easiest way to install a new or replace an existing Sillcock. The Frost-Free Anti Siphon is perfect for protection against freeze and burst pipes and protects the faucet from any potential back pressure and contaminated water flowing back into the main line.