vacuum apparatus 51 by means of the towing vehicle hitch 92 as illustrated in fig1 and the vacuum apparatus 51 is either backed toward the detachable hopper 1 or the detachable hopper 1 is pulled toward the vacuum apparatus 51 to engage each of the projecting bayonets 108 with the corresponding aligned hitch receptacles 3 the bayonet taper 110 in each of the bayonets 108 then contacts the downwardly extending bayonet guide 9 in the respective hitch receptacles 3 and causes each of the bayonets 108 to slide cleanly into the corresponding hitch receptacle 3 linear extension of the bayonets 108 continues until the respective bayonet slots 109 in the top edges of the bayonets 108 are aligned with the bottom of the corresponding coupling pin slots 5 at which time the respective coupling pins 6 are slidably displaced from the top of the companion coupling pin slots 5 downwardly to the bottom of the coupling pin slots 5 which now correspond with the bayonet slots 109 respectively this action locks each of the bayonets 108 in the corresponding hitch receptacles 103 and removably secures the detachable hopper 1 to the vacuum apparatus 51 as illustrated in fig6 and 14 it will be appreciated from a consideration of the drawings that the detachable hopper and vacuum apparatus of this invention may be towed by substantially any vehicle including a tractor truck.