NSF International 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 & Fittings and ASTM A 74 Standards: Specification for Cast Iron Soil Pipe and Fittings.