The hydraulics bench is mounted on lockable castor wheels and is constructed around a sturdy framework onto which all elements of the hydraulics bench are mounted. The main water storage tank from which the electrically operated external pump takes its water is situated on the framework. An on/off control on the front of the frame, together with a safety cut out controls the pump.
The storage tank is also used as the main drain of water from the relevant detachable modules of the HB series. The water is pumped into the modules and then allowed to flow/drain back into the main tank via hoses and pipework. The storage tank has a secured lid to keep dust and debris out. The pipe work connecting the storage tank and the modules ensure a closed system, which minimises the local water requirement but allows large flow rates and pressure ranges to be accommodated.