Fits most commercially available: Risers, Corrugated HDPE Pipe, IPEX PVC Ribbed Pipe.
20" & 24" diameters.
Vertical & horizontal safety screws. All Tuf-Tite Riser Lids come with a choice of stainless steel safety screws. 1.75" square drive or phillips drive screws.
Lid may be used with or without concrete center.
See PDF document (link included) for detailed installation options.