An enzyme tube is a long, shiny silver tube. There is a layer of the orange enzymes on the bottom parts of the tube. Occasionally, orange liquid enzymes will drip from it and keep going alongside a platform.
Enzyme tubes drip orange enzyme droplets, which fall to the ground below. When these droplets hit the ground, they will then proceed to slide across the platform they land on until they fall off. If Rex209 comes in contact with these droplets, then the Rex209 will explode and die.