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Certificates

Please contact SIGMA’s Engineering Department for all ISO Certificate requirements. ENGG@sigmaco.com

SIGMA Corporation has been manufacturing products for the North American Waterworks Industry for over 35 years. We offer the highest quality ductile iron waterworks fittings, pipe restraint products, drainage solutions, piping and plumbing products, fire protection products, HDPE products, and municipal construction casting products available on the market today. SIGMA has both domestic and imported inventories, and our comprehensive network of warehouse locations throughout the US and Canada provides prompt, efficient, and reliable service to our customers.