Our 24” Heavy Duty Cover fits French Drain Man Risers and Corrugated or ribbed pipe. These 24” heavy-duty covers are made of HDPE with the highest UV Protection on the market today. They have been tested up to 5,000 lbs. Every cover comes with a factory-installed gasket. These covers will withstand normal residential and light commercial traffic. This cover can be also used with our 24” Basins.