tank trailer 12 with pods 14 lime is transferred from its source through the hatches 10 into the tank 12 and urged out of the tank 12 by air pressure 13 through a flow pipe 15 into tubing 16 discharge of lime from the truck to the day tank is preferably through a four inch line the tubing 16 is coupled to a first end of a coupling apparatus 18 a second end of the coupling apparatus 18 is coupled to tubing 20 which leads into a day tank holding tank 22 lime is urged out of the day tank 22 by pressurized nitrogen gas applying a force 21 into a tubing 24 attached to the tank 22 tubing 24 attaches to a measuring bin 26 in a steel mill 32 the measuring bin 26 connects to processing pot 30 via tubing 28 lime travels from the holding tank 22 through tubing 24 into a measuring bin 26 in a steel mill 32 and finally through tubing 28 to processing pot 30 a rear gear 31 is positioned in tubing 28 fig2 is an exploded view of a coupling apparatus according to the present invention for use in the system of fig1 a coupling apparatus 18 couples tubing 16 with tubing 20 the coupling apparatus comprises a first end 40 which is attached to tubing 16 and a second end 36 which is attached to tubing 20 the coupling apparatus is readily detachable from tubings 16 and 20 the first end 40 of the coupling apparatus 18 is separable from the second end 36 and the first and the second ends are joined by means of fasteners such as screws 34 and nuts 42 placed through apertures 39 in the first 40 and the second 36 ends.