3/4", back flo preventer, dual check valve, use at drinking water supply service entrance or individual outlets, for non-health hazard residential water system containment & continuous pressure applications, install vertically or horizontally, temperature range 33 to 180 degrees Fahrenheit, minimum working pressure 10 psi to maximum working pressure 150 psi, buna-n seals & stainless steel springs, meets asse 1023 & csa b64.6, wetted surface of this product contacted by consumable water contains less than 1/4 of 1 percent of lead by weight, meets ab1953 California & vt s152 Vermont low lead restrictions.