A drain closure device for a vessel having an interior surface and a drain hole defined in the interior surface. The drain closure device includes a drain plug configured to be telescopically received in the central throughshaft defined in the insert sleeve. The drain plug is moveable between a first contacted ceiling position and a second expanded, drain position. The drain plug includes a seal member that is attached to the first end and a connection member located on a second end. The connection member is configured to releasably engage with at least one lateral shoulder or a suitable lateral projection member associated with the drain opening when the drain plug the use position.