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post #1 of 12 (permalink) Old 04-09-2004, 10:58 PM Thread Starter
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whats the link for those hobbby shop bulkheads for DIY CO2?
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post #2 of 12 (permalink) Old 04-09-2004, 11:41 PM
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post #3 of 12 (permalink) Old 04-10-2004, 12:13 AM
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Here : http://www2.towerhobbies.com/cgi-bin...LXG849&P=M

I use that but it doesn't hold the tubing tight. You can easily or accidently pull the tubing out from that bulkhead. I have to use a bit of silicone to hold the tube in place.
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post #4 of 12 (permalink) Old 04-10-2004, 12:28 AM Thread Starter
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can i just get the large ones with the smaller tubing to make it fit better?
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post #5 of 12 (permalink) Old 04-10-2004, 12:36 AM
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I haven't tried the larger one. You may not need smaller tube with that, I think. I don't use bulkhead no more. I use the 7/32 drill bit to drill the cap and squeeze the tubing. It works even without silicone. I do use silicone to hold the tube in place though.
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post #6 of 12 (permalink) Old 04-10-2004, 12:36 AM
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I've heard numerous tales of these bulkheads breaking very easily. That lead me the same things at home depot, except they were brass. But the alcohol and acid conditions in the DIY CO2 bottle corroded it.

Then, I found the simplest, cheapest, and most effective way to have a leak proof seal. Simply drill a hole smaller than the tubes diameter and stick the tube in. Voila! 110% leak proof. You can also pull out and re-insert the tubing anytime, just like you could on a bulkhead.
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post #7 of 12 (permalink) Old 04-10-2004, 12:44 AM
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I think the tale about that bulkhead getting brittle is just a tale. I've been using them for a while and none of them break. They are design to deal with RC plane fuel (which is my other hobby as well). If those can survive the fuel I don't see any problem with yeast solution.
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post #8 of 12 (permalink) Old 04-10-2004, 02:17 AM Thread Starter
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i'll just drill a hole.......what brand of tubing do yall use? i was thinking of getting the walmart kind
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post #9 of 12 (permalink) Old 04-10-2004, 05:22 AM
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I just use the regular silicone tube. It's not the best for CO2 but it gets the job done.
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post #10 of 12 (permalink) Old 04-10-2004, 04:01 PM Thread Starter
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do u know which one is?(the best)
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post #11 of 12 (permalink) Old 04-10-2004, 04:10 PM
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Hmm...this topic came up before, I'll dig it up and post it. But basically somone found a site that listed CO2 (as well as hundreds of other chemicals) and their permability with hundreds of various tubings.

Basically, silicone was by far the worst choice for CO2. It is still doable as ninoboy said - but there are better, and actually cheaper choices. I'll get that post up in a few...
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post #12 of 12 (permalink) Old 04-10-2004, 04:16 PM
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Here it is:
https://www.plantedtank.net/forum/vie...light=silicone

You will see that the smaller number = less CO2 permability. Just b/c though some of them have low permability doesn't mean they are the best though; weak acid tolerance is important. Make sure it is rated for weak acid because thats what CO2 and H20 make, H2CO3 (carbonic acid).

You will find another link in the first post...click on that and you can find further information. I use vinyl which I found @ homedepot, 20ft. for $1.96.
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