Air Cushioned swing check valve, Model 250-DSL, Cast iron Body acc. To ASTM A126, Class B with integral flanges, faced & drilled per ANSI B16.1 Class 125, Suitable for Horizontal or vertical installation. Valve body Full waterway type, designed to provide a net flow area not less than the nominal inlet pipe size when swung open no more than 25 degrees, Valve disc cast iron and faced with renewable resilient seat ring of rubber and stainless steel screws, complete with an outside lever and adjustable counterweight, complete with NEMA 4 limit switch