to fig1 a and 1b the frame 20 includes a bottom member 24 adapted for attachment to a support surface of the vehicle vertical supports 26 extend upwardly from the bottom member 24 and a top member 28 is attached to the vertical supports 26 the top member 28 is formed with an opening 30 near the front and two slots 29 near the rear thereof in the illustrated embodiment an intermediate support 32 is attached between adjacent vertical supports 26 and a bracket 27 is attached to the bottom member 24 the bottom member 24 top member 28 and bracket 27 are preferably formed of sheet metal while the vertical supports 26 and intermediate support 32 are preferably formed of tube steel both of which are readily available and inexpensive other materials having sufficient rigidity however may also be used the bowl 36 is provided for receiving waste material the bowl 36 has a curved sidewall 38 and an out turned flange 40 extending about an upper edge of the sidewall fig1 a and 1 b the out turned flange 40 further includes tabs 39 sized for insertion through the slots 29 formed in the frame top member 28 as best shown in fig3 a bottom of the sidewall is formed in an outlet 42 and the sidewall 38 is sized for insertion into the opening 30 of the frame top member 28 the outlet 42 fluidly communicates with a discharge valve 70 through a transfer pipe 44 the transfer pipe 44 preferably includes a collar 47 sized to frictionally engage and seal with the outlet 42.