Patent attributes
A coupler apparatus for use with concrete segments has a first duct having an end and an exterior surface, a first coupler member having a connector, a second duct having an end and an exterior surface, a second coupler member having a connector, and a gasket received in the connectors of the first and second coupler members for forming a liquid-tight seal between the first and second ducts. The first duct and first coupler member are embedded in a first concrete segment. The second duct and second coupler member are embedded in a second concrete segment. The gasket has a generally annular shape. The gasket has a bulge portion positioned between a first end and a second end. Each concrete segment has an end surface. The bulge portion fits between the end surfaces of the concrete segments.