1.1 This specification covers porous nonreinforced concrete pipe for use in underdrains.

1.2 A complete metric companion to this specification has been developed— 654M; therefore, no metric equivalents are presented in this specification.

1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.