Homewerks VFF-ASP-G19B Anti-Siphon Frost Free Sillcock, 3/4-Inch Male Thread and 1/2-Inch Female Thread, 3/4-Inch x 12-Inch Complies with Ansi B1.20.1 allows for simple and stable installation Notched flange design 3/4-Inch hose thread outlet Automatic draining if water is shut off, hose removed or open With integral vacuum breaker Meets ASSE 1019-A Meets ASME A112.18.1 / CSA B125 Standards