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

May 05, 2006 4 Replies
M

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


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S

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

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P

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.

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H

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.

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S

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

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