Prier C-434X12 12-Inch Self Draining Anti-Siphon Freezeless Hydrant with 1/2-Inch Pex Adapter Prier has made great efforts in developing unique, cutting edge products based on feedback 12" PRIER Self draining heavy duty residential wall hydrant 1/2" CRIMP PEX 2 backflow check valves and an anti-siphon vacuum breaker