Baughman’s exclusive Poly-Drain® 8-Slot perforated corrugated drainage pipe is specially designed for the heavy clay soils. Providing an unprecedented 11.5 square inches of water inlet area with 8 rows of slots in every valley, this perforation style allows for maximum water inlet. The 8-Slot pipe is manufactured to an overall higher wall thickness than its counterparts to allow for the same strong stiffness as pipe with fewer perforations. Moves up to 240 gallons of water per minute. We highly recommend PVC Tile Tape for all your connections to the high octane tile.