The 20" Polylok septic tank riser lids will fit only 20" Polylok septic tank risers or adapter rings. The cover locks into position and is fastened with included stainless steel screws.
The 20" covers are made of HDPE with the highest UV Protection on the market today. These covers will withstand normal residential traffic.
Lids include factory installed gasket for airtight and watertight applications.
