The dispensing of substances from multi-chamber containers, such as tubes, can be controlled by the placement of a flow modifying unit in the dispensing nozzle of the container. The dispensing nozzle will have a plurality of channels, usually one for each chamber. The flow controlling unit is a constriction at an intermediate point, a point between the channel inlet and exit, in at least one of the channels. This constriction is sized to adjust flow so that the viscous substance from each chamber is dispensed at a set flow rate and in a set ratio, one to the other. The constriction is formed at the time that the nozzle is formed. In the compression molding process a mold pin is used, the mold pin meeting a mold base at an intermediate point in at least one channel. The mold pin and or mold base has a recess that is the size and shape of the flow modifying constriction. Plastic is injected into the mold and the flow modifying unit is formed at the same time as the nozzle.