DIY CO2 Hose Sealing
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Old 07-27-2005, 11:58 PM   #1
kunerd
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DIY CO2 Hose Sealing


Hello all. Im pretty new to the forum and also planted tanks. Ive had fish for over a year now and never really tried plants.

I have read lots of the DIY CO2 2liter pop bottle instructions and they say that some have problems with sealing the hose to the cap of the bottle. I used some GE silicon used for bathroom tiles and it worked great. (so far ) Just thought I would share the idea with others.

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Old 08-01-2005, 05:24 PM   #2
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I don't use any silicone or any sealant on my hoses and they have worked out well. But it does take alittle persistance. I usually drill a hole in a smaller diameter than the hosing. Then it usually takes a bit of filing to make the hole slightly larger. Next squeeze the tubing to make it smaller (essentially collapsing the circle) and force it through the hole. Most of the time it takes a pair of pilers or tweezers to pull it though. I prefer this method because silicone tends to 'slip' after a few usages.
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Old 08-01-2005, 05:58 PM   #3
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good point sniper. I've also had troubles with using apoxy glue to seal the tubing. Im gonna give your suggestion a try. Thanks fo the tip
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Old 08-02-2005, 05:58 AM   #4
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I do that also with making the hole smaller and pulling it through yet what do you mean by SLIP after a while.
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Old 08-05-2005, 01:37 PM   #5
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I assume SynperP means that the silicone adhesive/caulk may lose it's grip on the cap, resulting in leaks. At least that's what I read.

I'll be setting up my first diy CO2 this weekend, and went w/ the glue-less method. We'll see how well that goes. By the way I used an 11/64" bit for drilling the cap and regular airline tubing (already had a bunch).
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Old 08-05-2005, 10:04 PM   #6
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I may be considered a Leaky DIY expert

I've had the best results by using a narrow hole and pliers, as SnyperP does, but then I heat a piece of aluminum rod that is slightly larger that the tubing's inside diameter, and push this into the tubing from the inside side of the cap. Then I pull the tubing a little bit back. Maybe it is overkill.

But the easiest way, the one I do now, is to get used Bic pens from work. If you remove the insides, you get a transparent tube, with a tapered end. Cut it in half (where the little hole is), and keep the side with the point. I put this into the hole in the DIY cap, tapered end pointing out, and seal with silicone. The tappered end makes it easy to connect the hose and get a very tight seal, and the bic tube being rigid as the cap, the silicone will not bend or move, and it will last for a very long time. I first tried with copper tubbing, but I prefer the transparent look, and was worried abut copper getting into the water.
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Old 08-06-2005, 02:06 AM   #7
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ooh! That's what I need.... I've been struggling with and getting frustrated with my leaky DIY for several months now. When I get it right, my plants grow like nuts. I've been going back between silicone and high strength quick setting epoxy. At least with the epoxy, I know quickly if there is a leak.
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Old 08-06-2005, 07:07 PM   #8
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I had posted this before elswhere, but what the local reef tank fanatics have been using for years is baking soda + crazy glue.

If you use a piece of rigid tubing, sprinkle some bakind soda where you want to make the seal, and add a few drops of crazy glue, the baking soda will soak up the crazy glue, and fill in the little gaps to give you a perfect seal.
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Old 08-06-2005, 11:47 PM   #9
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Well, I've setup my first diy C02.

Didn't use any silicone/sealant to seal the tubing, and it seems to be working
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Old 08-08-2005, 05:21 PM   #10
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Great thread.

I am looking also at attempting my first DIY Co2 and I am worried as hell about having leaks.

The bic trick looks like a good option.
Any thoughts of using a torch on the bic to melt it to the cap?
Would this work?

Is one of those one way regulators be a good idea to use?
You know connectors that only allow the flow one way?
Anyone knows what their name model are at Home Depot?

Any options out there to have a selant connector for the cap?

I am just considering the options.
Thx.
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Old 08-10-2005, 10:41 AM   #11
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Quote:
Originally Posted by HammerJoe
The bic trick looks like a good option.
Any thoughts of using a torch on the bic to melt it to the cap?
Would this work?
It might work but i would guess that when you twist the cap on and off multiple times the plastic on plastic bond might be really stiff and be easy to snap. Make any sense? Maybe if you covered that in silicone.
Quote:
Originally Posted by HammerJoe
Is one of those one way regulators be a good idea to use?
You know connectors that only allow the flow one way?
Anyone knows what their name model are at Home Depot?
Done know the name of them but it is a GOOD investment to get for cheap. I would assume you are talking about the ones that would keep from your DIY from pulling all your tank water slowly out of your tank into your room.
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