Camco 23303 Fresh Water Backflow PreventerFresh Water Backflow Preventer; 1 2 Inch Male NPT Thread x 1 2 Female NPT Thread; Brass; Complies With CA and VT Regulations For Brass Content; Single; With English French Spanish Language Packaging Allows fluid to only flow in one direction. Prevents backflow. Heavy duty brass body with stainless spring. End Size1: 1 2 Inch End Type1: Male Threads End Size2: 1 2 Inch End Type2: Female Threads Material: Brass Complies With CA VT Regulations: Yes