Abstract: A headrest adjustment system includes a tension block having a threaded aperture extending entirely through the tension block. The tension block is configured to be coupled to a chair. The headrest adjustment system also includes a screw configured to be moved through the threaded aperture along an axis, and a clamp lever pivotally coupled to the tension block. The clamp lever has an inclined surface. The axis intersects the inclined surface at an oblique angle. The headrest adjustment system also includes a headrest tension bracket configured to be coupled to the chair. The headrest tension bracket has a first end and a second end and the second end includes a flange. The clamp lever is configured to contact and press against the flange upon movement of the screw.

Abstract: A water control valve includes a valve body defining a valve body internal cavity, a first air inlet passageway in communication with the valve body internal cavity, a first water outlet passageway in communication with the valve body internal cavity, and a water inlet passageway. The water control valve further includes a valve cartridge removably coupled to the valve body. The valve cartridge is sized to fit at least partially within the valve body internal cavity. The valve cartridge defines a second air inlet passageway and a second water outlet passageway. The first air inlet passageway is aligned with the second air inlet passageway and the first water outlet passageway is aligned with the second water outlet passageway when the valve cartridge is coupled to the valve body.

Abstract: A headrest adjustment system includes a tension block having a threaded aperture extending entirely through the tension block. The tension block is configured to be coupled to a chair. The headrest adjustment system also includes a screw configured to be moved through the threaded aperture along an axis, and a clamp lever pivotally coupled to the tension block. The clamp lever has an inclined surface. The axis intersects the inclined surface at an oblique angle. The headrest adjustment system also includes a headrest tension bracket configured to be coupled to the chair. The headrest tension bracket has a first end and a second end and the second end includes a flange. The clamp lever is configured to contact and press against the flange upon movement of the screw.

Abstract: A water control valve includes a valve body defining a valve body internal cavity, a first air inlet passageway in communication with the valve body internal cavity, a first water outlet passageway in communication with the valve body internal cavity, and a water inlet passageway. The water control valve further includes a valve cartridge removably coupled to the valve body. The valve cartridge is sized to fit at least partially within the valve body internal cavity. The valve cartridge defines a second air inlet passageway and a second water outlet passageway. The first air inlet passageway is aligned with the second air inlet passageway and the first water outlet passageway is aligned with the second water outlet passageway when the valve cartridge is coupled to the valve body.