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.
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