Mentos geyser tube: re-Make

Step 4 The release system

I experimented two different release systems, both located on the 1/2" coupling tube:

• The first one is the most classic one: drill two aligned 1/32" holes perpendicular to one end of the 1/2" coupling tube, on each side, where you will then put a paper clip. The setback of this system is that the Coke, in the process, will also escape from these little holes.
• The second one works very well too and is more "leak proof": instead of a paper clip, it is using two small magnets (on outside the 1/2" coupling tube and on inside). For this system, instead of drilling small hole, you'll have to machine the coupling tube in order to flatten the tube and thus make a stable base for the magnets.

Whatever system you're using you'll have to attach the paper clip or one of the magnet to a small cord (~ 6ft - 9ft) in order to remotely release the system.