A Telescopic Access Collar is an adjustable polyethylene (PE) liner for manhole-grade adjustment rings. The collar provides protection for grade rings from corrosion and water infiltration for a fully-lined concrete structure; it allows both vertical and horizontal adjustments to suit the grade and chamber. The Telescopic Access Collar is a one-piece, rotationally molded polyethylene sleeve with a 2” (50mm) sealing flange around the top edge. The inside diameter of the access opening is 24” (610mm). It is installed with a lip seal gasket allowing for an effective adjustable height of 8” (203mm).