Rain Bird HT075BFFS Drip Irrigation Backflow Preventer and 150 Mesh Filter, 3/4" Female Hose Thread. Backflow Preventer and 150 Mesh Filter quickly, and easily connects to any 3/4” male pipe threaded (MPT) outdoor faucet, garden hose or component. Safely prevents backward flow of water from a Drip i...

Camco's 23303 RV 1/2" Back-Flow Preventer allows water to only flow in one direction to prevent backflow. It has a heavy-duty brass body with a stainless spring. 1/2" Male x Female NPT.

Attached to sill cocks, valves, and hydrants with Male hose thread outlet. For indoor or outdoor use. Designed to prevent dangerous back siphonage and back flow into a potable water supply. Furnished with break-a-way lock screw if vandal-resistant installation is desired. For nonfreezing areas only....

Plumb Craft Waxman 7032000N Back Flow Preventer