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A check valve structure for use in a drain such as a floor or pavement drain can be constructed utilizing an annular elastomeric member positioned between two rigid end plates. These plates are connected so that they can be moved toward one another when they and the member are inserted in a drain or

A check valve structure for use in a drain such as a floor or pavement drain can be constructed utilizing an annular elastomeric member positioned between two rigid end plates. These plates are connected so that they can be moved toward one another when they and the member are inserted in a drain or drain housing in order to compress the member to cause the member to expand in outer diameter into contact with the interior of the drain or drain housing in order to mount the structure in an operative position. A valve seat is located on the lower plate and a buoyant valve member is movably supported on the upper plate so as to be capable of being moved with respect to the valve seat. In the event of accumulation of water in the drain or drain housing or in the event of back flow into the drain or drain housing the valve member will move against the seat.

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