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Amazon.com: Homewerks VFF-ASP-C19PA Anti-Siphon Frost Free Sillcock, 1/2-Inch Male Thread or 1/2-Inch Solder, 1/2-Inch inlet by ¾ inch garden hose thread outlet by 12-Inch in length : Everything Else
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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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Arrowhead Brass 4 in. Lead Free Anti-Siphon Frost Free Hydrant with Built-In Vacuum Breaker 466-04LF - The Home Depot
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HOMEWERKS 3/4 in. Push-Fit x 12 in. Brass Anti-Siphon Frost Free Sillcock Valve P140-8-34x12 - The Home Depot
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Amazon.com: Midline Valve 84283P Anti-Siphon Sillcock Frost Free Outdoor Faucet with 1/2 in. PEX Connection and 3/4 in. Hose Bib, 8 in. Long, Chrome : Everything Else
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Proplus Part # LB 60 - Proplus 1/2 In. Mip, 14 In. Anti-Siphon Frost-Proof Sillcock, Valve - Hose Bibbs & Sillcocks - Home Depot Pro
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Legend Valve 12-in L x 1/2-in MNPT Lead-free Alloy Anti-Siphon Quarter Turn Sillcock in the Sillcocks & Hose Bibbs department at Lowes.com
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