SEPTIC TANK DRAINAGE TILE

摘要

A septic tank drainage tile including a corrugated elongated tube of polymeric material. The corrugations are equally spaced from each other with the exception of periodic circumferential flats which have a width equal to the width of two roots and one crest. The flats are located at the root or minor diameter level of the corrugated tube and form drainage channels on the outside of the tile. Relatively large annularly spaced openings in the flats have an axial dimension less than the width of the flat but greater than the width of the roots.