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Don't use rubber tubing use vinyl tubbing (clear).
I used to work at a hardware store for 6 years as a young lad. Every friday night and saturday night someone would come in for the following.
1. Funnel
2. 3 to 6 feet of clear vinyl tubing
3. hose clamp (that tightens with a screw)
I've seen people use 5 funnels connected to a board nailed to a balcony with 6 foot tubes for multiple bongs.
I've seen two funnels connected with tube and a y connector for mixing drinks. Or even valves at the end so you can load the drink without holding it closed with your thumb.
Make sure the tube is clear so they can see their progress.
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"Remember, it takes two to lie. One to lie and one to listen." -Homer
Unless you are the freakin Highlander, what is the point in learning how to fight with a sword?
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