Rubber Adjustment Riser
Manufactured by Presfab Highway Inc.
Rubber adjustment riser for catchbasins/manholes, available in flat or tapered configurations of round, square and rectangular with thicknesses ranging from 13 mm (.5") to 75 mm (3").
Drainage and Sewer Works | Maintenance Hole, Catch Basin, Ditch Inlet Units and Valve Chambers | Accessories | Adjustment Units | Rubber
Ontario Provincial Standards
OPSD 704.010 - Maintenance Holes, Catch Basins and Valve Chambers, Precast Concrete Adjustment Units
City of Barrie
BSD-41 - Maintenance Hole and Catch Basin Grade Adjustment Units