The Woodford 17P-10-MH is a model 17 Series freezeless wall Faucet will not rupture when hose is removed & valve is shut off & features an anti-siphon for backflow prevention with a 1/2″ Female thread or 3/4″ Male thread inlet & has a powder coated cast aluminum handle & includes an intergal backflow prevention device & uses an atmospheric vent & patented Check to provide anti-siphon protection.