A combination sink strainer and stopper for a sink having a predefined sink opening through which fluid and limited waste passes includes a strainer cup having a continuous sidewall and a bottom connected to said sidewall, a strainer cup including a plurality of openings therethrough to provide a straining of debris over a predetermined size of the openings and a cover plate pivotally connected to the strainer cup which when the strainer cup is disposed in the sink opening, the cover plate is permitted to pivot to a first closed position and close and cover the strainer cup in a manner to seal about the sink opening and a second open position wherein the strainer cup is at least partially not covered by said cover plate and permit fluid and the limited waste therethrough.

A stopper mechanism for a drain includes one of a magnetic stopper and a diamagnetic and a magnetic field generator with a fixed position in relation to the drain which produces a magnetic field having a precise combination of position, geometry, and strength to support the stopper in a stable, levitated, distal position with relation to a drain to permit fluid and waste to pass by the stopper and which does not provide any contact points for collection of debris thereon, and wherein the magnetic field can be changed to cause the magnetic stopper to engage the drain to restrict flow through the drain. The application of the electromagnetic levitation principles creates a truly clogless drain mechanism.

A pop-up drain assembly for a sink has drain piping, a stopper in the drain piping and a pivot rod for opening and closing the stopper, which tends not to clog because the pivot rod is not within a fluid flow path. In one embodiment the stopper has flow diverter plates that channel fluid flowing through the drain piping away from the pivot rod so that hair, waste and debris does not catch on and accumulate on the pivot rod. In another embodiment the stopper and the pivot rod are engaged through magnetic coupling, and the pivot rod does not protrude into the fluid flow path. The stopper is preferably variable in length for adjustment to fit different distances from the pivot rod to the top of the drain piping.

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.

An automatic drain system may comprise a drain including a neck defining a drain orifice and a flange extending from the neck. A liquid detection sensor is located on at least one of the neck or the flange. A sink assembly may comprise a sink basin and the drain located in a sink opening formed in the sink basin.

A drain system for controlling a water level in a bathtub includes a drain exit assembly coupled to an exit drain of the bathtub and configured to receive water exiting the bathtub, a valve fluidly coupled to the drain exit assembly and operably coupled to a motor, and a pressure sensor communicatively coupled to the valve and in fluid communication with the drain exit assembly. The motor is configured to change the operational state of the valve based on a pressure sensed by the pressure sensor to control a water level within the bathtub.

A stopper mechanism for a drain includes one of a magnetic stopper and a diamagnetic and a magnetic field generator with a fixed position in relation to the drain which produces a magnetic field having a precise combination of position, geometry, and strength to support the stopper in a stable, levitated, distal position with relation to a drain to permit fluid and waste to pass by the stopper and which does not provide any contact points for collection of debris thereon, and wherein the magnetic field can be changed to cause the magnetic stopper to engage the drain to restrict flow through the drain. The application of the electromagnetic levitation principles creates a truly clogless drain mechanism.