Importance

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Abstract

A pipe coupling and gasket, a pipe coupling system, and installation method for joining and sealing adjoining pipes having different outer diameters. The gasket including three flanges extending radially inward, with the middle flange acting as a fulcrum against the outer surface of the larger pipe to cause distension of the opening of the gasket receiving the smaller pipe, to permit easy entry of the smaller pipe into the gasket. The gasket is then slid over the larger pipe so that the middle flange slips over the edge of the larger pipe to relax the opening of the gasket receiving the smaller pipe. The middle flange can also form a sealing surface on the outer diameter surfaces of the larger pipe or on both the larger and smaller pipes. The middle flange can also form a sealing surface against the radially extending end surface of the larger pipe.

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First Claim