Abstract: An adjustable double-purpose tool that is intended for use as an attachment for a standard pool pole. The tool includes a straight handle with a spring-lock for securing it to one end of the pole and a double-faced head for holding a chlorine cake on one side and a scrubbing pad on the other side. The head is pivotally attached to the handle and its orientation can be adjusted at fixed intervals by a key-sprocket mechanism. The mechanism is especially designed so that the key can be actuated from a distance, thus making it possible to adjust the tool without retrieving it from the water.

Abstract: An enclosed valve with one inlet connected by a rotating gate to two alternative outlets. The fluid pressure keeps the gate in position to seal the first outlet while the second one is open. When the pressure is sufficiently reduced, a spring releases the gate from the first outlet and swings it to a new position, whereby it leaves the first outlet open and seals the second outlet. That gate position is maintained upon repressurization until a new pressure drop is experienced. Then, the reverse takes place and the gate swings in the opposite direction to open the second outlet and again seal the first one.