The 2" Tri-Check Valve is designed for basement sump, septic system, and effluent applications to prevent backflow. This valve can be installed in the vertical or horizontal orientation in the discharge line. Zoeller® Tri-Check® Check/Ball Valve, Union Combination, 2 in Nominal, Socket Welded End Style, 25 psi Pressure, 130 deg F, PVC Body, Neoprene Softgoods