CISPI is dedicated to serving plumbing engineers by providing information on industry and product specifications, as well as model codes. Our regional representatives are also available to answer any questions or provide guidance as you work to design reliable and efficient plumbing systems.

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Authority Having Jurisdiction

CISPI strives to be a resource for the AHJ community, providing information as requested to inspectors and code officials.

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James Walls


CISPI serves plumbing contractors as a resource for cast iron product questions on installation, proper use, specifications and codes. CISPI representatives are available to visit jobsites as needed and to provide their expertise with regard to the manufacture and use of cast iron soil pipe and fittings.

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The mark of quality cast in iron

The Cast Iron Soil Pipe Institute (CISPI) was organized in 1949 by the leading American manufacturers of cast iron soil pipe and fittings. The Institute is dedicated to aiding and improving the plumbing industry.

Through the preparation and distribution of technical reports, we seek to advance interest in the manufacture, use and distribution of cast iron soil pipe and fittings, and through a program of research and the cooperative effort of soil pipe manufacturers, we strive to improve the industry’s products, achieve standardization of cast iron soil pipe and fittings, and provide a continuous program of product testing, evaluation and development. Since the founding of the Institute, member firms have standardized soil pipe and fittings, and have introduced a number of new products.

Assurance that pipe and fittings meet the approved standards and tolerances of the Institute is provided either by Ç®; or the CI NO-HUB® trademarks which are the collective marks all member companies may place on their products.