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The Plumber's Choice 4 in. Anti-Siphon Sillcock Frost Free Outdoor Faucet with 1/2 in. MIP/Sweat Connection and 3/4 in. Hose Bib SILLVAC4 - The Home Depot
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STYDDI Frost Free Sillcock, 8-Inch Anti-Siphon Outdoor Wall Hydrant, Outdoor Garden Faucet Spigot with Backflow Preventer, with 1/2" Push-to-Fit Connector - Walmart.com
![Woodford Model 17 8-in L x 1/2-in Copper Sweat Brass Anti-Siphon Push/Pull Sillcock in the Sillcocks & Hose Bibbs department at Lowes.com Woodford Model 17 8-in L x 1/2-in Copper Sweat Brass Anti-Siphon Push/Pull Sillcock in the Sillcocks & Hose Bibbs department at Lowes.com](https://mobileimages.lowes.com/productimages/a0d0888c-bbe4-49a6-a2b4-f79699d7aeb1/00536923.jpg)