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rubber bung that fits a 2LTR bottle.. Help!

Can any of you help me out.... I'm doing a project with my kids on bottle rockets and need to find a couple of bored rubber bungs that will fit into (and seal) a standard 2 LTR drinks bottle (like any of the ones sold filled with fizzy pop)

I can't find anywhere locally to test this out and really need to find out which size is best so that i can order them from the internet... can any of you guys advise me... or even better, try this out and tell me the size I need?

What would be extra useful is if you can also give me a tip as to where i can order them from..?

I hope ypu can help as we have a couple of great designed rockets just waiting to be launched...!!!

Thanks,

Mark Taylor

Reply to
Mark Taylor
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Mark:

I believe that a #3 bung fits a standard PET pop bottle. However, its been quite a while since I tried it, and I don't have a #3 at home at the moment.

Steve

Reply to
Steve

If I may suggest:

Save the cap from the bottle. Bore it out with a small drill to fit your tubing, remove the little blue plastic seal thingy and add some epoxy or silicone to the inside and wait. Instant seal.

Reply to
purduephotog

Also consider the 3 liter PET bottles with the wider mouth that some off-brand colas come in. I think a #6 or 7 stopper will fit.

Reply to
hot-ham-and-cheese

Mark:

I remembered your question while I was i the store today, so I did some testing.....

standard pop bottle.... #2 bung - much too small #3 bung - very good fit (to best of my knowledge, #2 1/2 & #3 1/2 do not exist)

the larger mouth pop bottle (I tested a 1 litre Aquafina bottle, presume that others are the same mouth size) #6 bung - OK # 6 1/2 - better fit #7 too big

Steve

Reply to
Steve

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