with bell-crank operation were also made, usually for shallow water work. The piston rods are connected to the beam near the pivot. Upward movement of the pistons pulls the air into the cylinders through the inlet valves, and then downward movement pumps the air through the hose to the helmet of the diver in a single action pump. Cylinders, valves and outlet for air are usually made from brass for reliability.

Other components

The pump may be mounted in a cabinet for protection during transport and storage, and may be fitted

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