The 100712LF Series sweat-end lead-free brass check valves feature a spring-loaded soft seat for fast action and bubble-tight shutoff at high and low pressures. Made with no bismuth or silicon additives so they're easy to solder without special handling or high-temperature solders. Forged lead-free brass body is strong and light with zero porosity and comply with all lead-free regulations. The valve’s polyetherimide disc is abrasion and corrosion resistant and operates from +10˚ to 210˚F. Its interior body design prevents potential side loading with high flow capacity and low pressure loss. The seat spring is made from stainless steel with a cracking pressure of .5 psi. Sizes from 1/2" to 2" FxF. Max working pressure 200 wog.