inside the ring having circular fins that are disposed inwardly toward the center of the gasket a series of fins increase in length from the front end of the gasket toward the back end thereof and are adapted to contact the outer surface of a pipe inserted into the gasket opening to compress the gasket in stages against the inside surface of the hole application_number US 42692882 A description turning initially to fig1 4 wherein like component parts are identified by like numerals there is shown an annular pipe gasket generally referenced 10 which embodies the teachings of the present invention in this particular embodiment of the invention the gasket is formed of a rubber like material capable of forming a fluid tight seal between a concrete sewer pipe section 13 and the inner wall of a pipe receiving opening 11 formed in a concrete manhole riser 12 or the like as best seen in fig1 and 2 in assembly the gasket is contained within a hole that has been cast or otherwise formed in the manhole riser as will become evident from the disclosure below the present gasket because of its unique construction can be easily inserted into the opening and snapped into place to provide a self supporting structure that locks itself against the inner wall of the hole and resists axial movement as a pipe is passed therein it should also be noted that the gasket can be easily removed from assembly without the need of special tools and without.