The TUF-TITE 24″ Heavy Duty Flat Lid seals to the riser with a molded-in lid gasket to assure a watertight seal every time. The lid is secured with 4 horizontal and 6 vertical stainless steel screws (included). Made for heavy-duty protection & walk over. 24-RISL-GREENStainless Steel Screws IncludedMolded-in Gasket – no more fighting with O-rings
