Abstract: An air valve for controlling the supply of air to a venturi jet of a spa includes a housing, a cylindrical barrel, means for sealing between the housing and the barrel, and means for rotating the barrel. The housing has an interior chamber extending between an open, cylindrical bore at one end and a pipe coupling at the other end. The housing mounts on the inside wall of the spa, with the open end of the bore facing the inside of the spa and the rest of the housing extending through the side wall and positioned outside the spa. The cylindrical barrel is insertable into and rotatably mounted within the cylindrical bore of the housing. The housing and barrel each include ports that, when overlapping, provide a path for air to flow from a point exterior of the housing, through the overlapping ports, through the interior of the barrel and housing to the pipe coupling. Rotating the barrel to a position where the ports do not overlap blocks the air flow path.

Abstract: An improved drive shaft seal including a first sealing ring to be mounted within a housing, a second sealing ring to be mounted within the housing in contact with the first sealing ring in such a manner that one ring rotates relative to the other, and a thermally conductive cup having an end portion to be mounted in contact with one of the rings within the housing and a wall portion extending outside the housing. Heat is dissipated from the rings through the cup to the atmosphere surrounding the housing. In a preferred embodiment, the wall portion of the cup is perforated and ring-shaped so as to have large surface area and a large surface area-to-volume ratio. In another preferred embodiment, a fan is mounted outside the housing so as to blow air past the wall portion of the cup. The invention may be embodied in a pump, in which the first sealing ring is attached to the pump drive shaft so as to rotate with the drive shaft.