The 3-inch PVC wafer check valve from Asahi/America, installed on the discharge side of pumps, is designed to prevent backflow flooding. The valve’s body, disc and stopper assembly are machined from solid PVC plate stock that conforms to ASTM D1784 cell classification 12454A. The check valve is available in 3- through 12-inch PVC with EPDM seals and no spring. All 3- through 8-inch check valves operate at a maximum pressure of 150 psi; 10- and 12-inch at 90 psi and up to 120 degrees F. 800/343-3618; www.asahi-america.com.