Back   Sanitary Sewers and Forcemains List #  4.70.48.70 Maintenance Hole Adjusters Rubber Date:  Jan 17, 2022 SPECIFICATIONS: OPSS 1853 Specific Requirements: 1) Thickness of each rubber adjustment unit shall not exceed 38 mm.   Company Product Model/Series Remarks American Steel and Rubber Inc. Maintenance Hole Adjuster Flex-O-Rings   GNR Technologies Inc. Infra-Riser Infra-Riser