Abstract: A control system for hydro-massage tub systems in which water is circulated through a pump and heater from the tub back to a plurality of jets in the tub to create a turbulent massaging action. The system is comprised of an activating device, a pump, a switch activating circuit, a heater with proportional control and a water level sensing safety system. The pump is controlled by a switching and timing circuit that limits the time the pump is on which is slaved to a heater control circuit to prevent operation of the heater unless the pump is circulating water. The proportional heater control circuit maintains the water temperature within a degree or two of a preset temperature by proportionally reducing power as the temperature approaches the preset limit. The activating device transmits a ignal to the switching and timer circuit when a mechanical plunger isolated from electrical circuits is operated.

Abstract: A nozzle jet cartridge assembly for whirlpool bathtubs and the like in which an eyeball or spherical nozzle jet is mounted in a cylindrical housing. The spherical nozzle jet is positioned in the housing by a retaining ring and spring and the housing is closed by a locking ring. This assembly provides a nozzle jet cartridge which can be easily installed in a socket provided by a coupling fitting a hole in the wall of a whirlpool tub. An interchangeable trim ring and a locking nut secure the nozzle jet cartridge assembly to the tub wall.