Watts 3/4" Back Flo Preventer is a dual check valve that is used at drinking water supply service entrance or individual outlets. It is for non-health hazard residential water system containment and continuous pressure applications. It can be installed vertically or horizontally. It has a temperature range of 33 to 180 degrees Fahrenheit and a minimum working pressure of 10 PSI to a maximum working pressure of 150 PSI. It has Buna-N seals and stainless steel springs. It meets ASSE 1023 and CSA B64.6. The wetted surface of this product contacted by consumable water contains less than 1/4 of 1 percent of lead by weight. It meets AB1953 California and VT S152 Vermont low lead restrictions.