This specification covers porous nonreinforced concrete pipe for use in underdrains. Pipe manufactured according to this specification shall be of two classes identified as “standard porous nonreinforced concrete pipe”, and extra-strength porous nonreinforced concrete pipe.

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

1.2 This specification is the metric counterpart of Specification C 654.