Backflow Preventer and 150 mesh filter quickly and easily connects to any standard outdoor faucet, garden hose or component. Safely prevents backward flow of water from a Drip irrigation system into your potable/clean drinking water supply. Stainless steel 150 mesh filter catches debris to help keep system functioning properly. Simply thread into place; take care fitting is fully tightened so rubber gasket can correctly seal, assuring leak-proof performance. Constructed of highly durable UV and chemical-resistant materials to assure long life.