Homewerks VFF-ASP-C19B Anti-Siphon Frost Free Sillcock, 1/2-Inch Male Thread and 1/2-Inch Solder, 1/2-Inch x 12-Inch Notched flange design allows for simple and stable installation Notched flange design 3/4-Inch hose thread outlet Brass body With integral vacuum breaker Meets ASSE 1019-A Meets ASME A112.18.1 / CSA B125 Standards