1.1 This specification covers concrete drain tile with internal diameters from 4 to 36 in. that are intended to be used for surface and subsurface drainage. 1.2 A complete metric companion to Specification C412 has been This specification covers concrete drain tile, of specific internal diameters, intended for surface and subsurface drainage. The concrete shall consist of cementitious materials, mineral aggregates, and water. The cementitious materials could be cement