A device for controlling the duration of time water is retained in a bath tub or other liquid retaining receptacle; the device comprising a timer element and a plug assembly operable between a closed state and an opened state; the plug assembly changing from the closed state to the opened state at the expiry of a time duration pre-selected on the timer element.

A drainer with quick drainage and improved structure has a drain body and a draining unit disposed in the drain body for stopping and draining water; the draining unit includes a base, a movable element, a rotatable element, a spring for ejection, an engaging ring element, an upper cover, and a rubber piece. The base has an inner tube in the middle, a periphery ring body, and a plurality of connecting ribs. The inner tube has a top end being higher than a top of the periphery ring body and an engaging space formed on the inner periphery thereof for the base to be disposed inside the drain body. The spring for ejection, the rotatable element, and the movable element are sequentially disposed in the inner tube and then the engaging ring element is mounted on the top end of the inner tube to form a movable unit for pressing with the upper cover mounted on the movable element and the rubber piece mounted on the periphery of the upper cover.

A device for controlling the duration of time water is retained in a bath tub or other liquid retaining receptacle; the device comprising a timer element and a plug assembly operable between a closed state and an opened state; the plug assembly changing from the closed state to the opened state at the expiry of a time duration pre-selected on the timer element.