assembly 15 the external suction assembly comprises female flared tubing 14 fig3 partially or totally surrounded by a locking collar 13 fig3 the external connecting apparatus is connected to the center bung assembly 1 by the female flared tubing 14 fig3 and locking collar 13 fig3 tubing 14 fig3 from the flared locking collar connects the suction tube assembly to the dry break quick disconnect assembly 15 which includes compression fittings 23 and 25 having internal check valves and a release tab 24 the internal check valves provide a leakfree connection which allows flow of the chemical liquid when connected and prevents flow when disconnected the dry break quick assembly is connected to the mechanical metering pump 17 by tubing 16 fig3 the internal connecting apparatus 21 comprises an internal suction assembly 19 and the center bung assembly 1 the internal suction assembly comprises a foot check valve assembly 10 which prevents reverse flow and tubing 11 fig3 which connects the internal suction assembly to the center bung assembly 1 liquid chemicals are withdrawn from the container and dispensed by applying suction with the mechanical metering pump 17 this withdraws liquid chemicals from the sump 9 through the internal suction assembly 19 which contains the foot check valve 10 to the center bung assembly 1 where they flow through the external connecting apparatus 20 to the mechanical metering pump 17 where they are dispersed liquid chemicals which are dispensed from the containers preferably have viscosities such as from 100 to 300 centipoise examples of such liquid chemicals are corrosion.