The Pump Casing Is Made Of Durable Polypropylene And The Coer Is Made Of Acrylic. The Drainage System Has 3 Inlet Pipes (2 Of 19.1 mm (3/4”) And 1 Of 25.4 mm (1”) And A Discharge Pipe With A Check valve For Pipes Of Diameter 19.1 mm (3/4”) And 25.4 mm (1”).