Patent ID: 6196760
Filing Date: 2001-03-06
Classification: E02D

Abstract:
An adjustment riser for use in a hole comprising:a molded body having an inner peripheral wall and an outer peripheral wall, said inner peripheral wall defining an orifice,first and second, spaced apart, opposed sealing faces extending between said inner and outer peripheral walls,at least one continuous, elongate rib extending outwardly of said first face and a corresponding number of continuous, elongate grooves in said second face,each at least one rib having a convexly curved outer end, and a vertical height greater than the corresponding vertical depth of a mating groove of a mating riser, each groove having a flat floor and opposed side walls extending from said flat floor,each at least one rib being in opposed relationship with a said groove, and being sealingly matingly received by a corresponding groove in a mating riser having a similar molded body, such that in mating the convexly curved outer end of each rib is deformed into sealing engagement with the flat floor of the mating groove between said opposed side walls of said mating groove.