in fig4 fig3 shows components contained in the lower portion of container 32 accessible by lifting out the tray 30 these components include a second water conduit comprising an inlet water pipe 80 having a hose coupling 81 protruding from one side of the container an outlet water pipe 82 having a hose coupling 83 protruding from the opposite side of the container and a gear pump 84 connecting these pipes the pump being mounted on the bottom of the container a suitable gear pump is model no 700721 made by burke water systems industries 1985 ltd of ville st laurent quebec canada the gear pump is driven via a flexible coupling 86 and shafts 87 by a compressed air driven rotator in the form of a direct drive air driven drill 88 held by a clip onto a platform 89 mounted on the bottom of the container 32 a suitable drill is a 3 8 inch drill model tl1006 sold by campbell hausfeld this drill is supplied with compressed air via a tube 90 which leads out through the side of the container being provided on the outside with a male quick connecter 91 the parts shown in fig3 normally remain enclosed the only access required being to the connector 91 and the ends of pipes 80 and 82.