Prier C-144W12 12-Inch Anti-Siphon Freezeless Hydrant with 1/2-Inch Wirsbo Pex Adapter Prier has made great efforts in developing unique, cutting edge products based on feedback 12" PRIER Residential Wall Hydrant, Heavy Duty, Anti-Siphon, 1/2" WIRSBO Pex Connected to the supply piping in the heated portion of the structure, eliminating the possibility of freezing