NSF International has announced that The Cast Iron Soil Pipe Institute (CISPI) member companies’ soil pipe and fitting products have been certified. Cast iron soil pipe and fittings are used in building construction for sanitary and storm drain, waste and vent piping applications. NSF certification demonstrates compliance with the CISPI 301:Hubless Cast Iron Soil Pipe & Fittingsand ASTM A 74 Standard:Specification for Cast Iron Soil Pipe and Fittings.