to provide an aperture through which a flexible hose may extend as hereinafter described the door also includes an upper panel 26 which extends right angularly from the upper edge of rear panel 22 the door is seen to swing from a horizontal interior wall or floor partition 30 that extends between the two side walls 13 as best shown in fig4 the interior floor partition 30 merges with an interior upright partition 31 that extends upwardly therefrom to a cup shaped wall 32 that extends reentrantly downwardly from the top wall 15 to provide a hand grip the door panel 26 is seen to swing away from and towards a position in close proximity with the rear portion of the hand grip finally an intrument panel 35 is mounted on an inclined front portion 15 39 of the top wall a pressure meter 36 and a manually actuatable switch 37 are mounted on this panel with continued reference to fig4 the housing is seen to house a battery 40 which is mounted upon a ledge 41 that juts upwardly from the floor 14 electrical wires extend from battery terminals 43 to a jack 44 mounted to rear wall 12 accessibly to ambience an air compressor shown generally at 45 is mounted by screws 46 to a side wall 13 of the housing above the battery 40 the air compressor includes a d c motor 47 having terminals 48 from which wires extend to jack 44 through switch 37 where they are joined with the battery wires so as to couple the battery across the compressor motor an air outlet pipe 53 extends upwardly from and beside the air.