Ultimate diy co2 cap? - The Planted Tank Forum

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post #1 of 17 (permalink) Old 02-07-2013, 10:41 PM Thread Starter
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Ultimate diy co2 cap?

What do you think? 5 bucks each on fleabay.

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Last edited by Sugardaddy1979; 03-14-2013 at 01:13 AM.
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post #2 of 17 (permalink) Old 02-07-2013, 10:53 PM
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Very nice! If I did any buying on EBay I'd be all over this! Also nice to see another Dawg fan!
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post #3 of 17 (permalink) Old 02-07-2013, 10:59 PM Thread Starter
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Sic em!

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post #4 of 17 (permalink) Old 02-08-2013, 01:11 AM
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Has anyone bought one of these? If so, does it fit a standard 2L bottle very well? It is a great deal, at $5 with shipping included.

They illustrate the usage of this by showing it on a 2L bottle with a 90 psi pressure gage on the other opening, and no safety valve showing. Will one of those bottles actually hold that much pressure?

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post #5 of 17 (permalink) Old 02-08-2013, 01:38 AM Thread Starter
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I'm thinking I might throw 15 bucks out there and try it.

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post #6 of 17 (permalink) Old 02-08-2013, 01:41 AM Thread Starter
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On mythbusters they said the bursting pressure was 90 psi. I saw once where someone built in a pressure release valve, but I can't find it now. They used a needle valve and everything.

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post #7 of 17 (permalink) Old 02-08-2013, 01:53 AM
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I stumbled across this a while back when I found myself intrigued by SodaStream. It's a 5lb cylinder with a reg set at 60 psi. The guy says he's tested it to 90.

http://www.youtube.com/watch?v=y7L_dxtOCZI

edit - he also mentions that he picked up the cap and quick-release for 6 bucks shipped Evilbay. Not the same as pictured above.

Last edited by kevmo911; 02-08-2013 at 02:12 AM. Reason: btw
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post #8 of 17 (permalink) Old 02-08-2013, 04:59 AM
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Could you specify the name of th eitem I would be looking at on electronic purchase bay?

Like "reusable CO2 bottle lids" or something like that. Thanks.
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post #9 of 17 (permalink) Old 02-08-2013, 05:04 AM
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So if the average pop bottle can hold 90psi and you use one of those caps, could you "refill" the pop bottle with a pressurized C02 setup ? That would be way better than mixing sugar and yeast every 2 weeks !

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post #10 of 17 (permalink) Old 02-08-2013, 06:13 AM
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Quote:
Originally Posted by Simpsoid View Post
Could you specify the name of th eitem I would be looking at on electronic purchase bay?

Like "reusable CO2 bottle lids" or something like that. Thanks.
I'd like to know this as well. Very nice find! So you would put 2 airline tubes into a T-valve and then connect the end of the hose to a NV? Seems pretty easy.
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post #11 of 17 (permalink) Old 02-08-2013, 08:48 AM
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Quote:
Originally Posted by stevenjohn21 View Post
So if the average pop bottle can hold 90psi and you use one of those caps, could you "refill" the pop bottle with a pressurized C02 setup ? That would be way better than mixing sugar and yeast every 2 weeks !
I'm not quite sure I understand the point of this; wouldn't you have a pressurized system that you could use instead of this?

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post #12 of 17 (permalink) Old 02-08-2013, 12:09 PM
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Are you telling me that you have 1 pressurized system that runs multiple tanks ? If so then thats great, but for me i have 1 pressurized system in a room and a DIY C02 running in a different room ..... hence it would be great if i could just refill my pop bottle from my pressurized system.

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post #13 of 17 (permalink) Old 02-08-2013, 01:16 PM Thread Starter
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I don't think that would work. You could potentially refill your own paintball can I guess. Or use a manifold and run to your other tank, but I don't know close to enough about pressurized to tell you how to do either. We were talking about the psi a soda bottle can hold related to controlling the co2 out of a diy system.

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post #14 of 17 (permalink) Old 02-08-2013, 03:42 PM
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I'm happy with my current method of making caps, but I think I'll get one of these to play with anyway. Thanks for the heads-up!

I agree refilling a 2L bottle from pressurized CO2 wouldn't work. At 90PSI, CO2 is still in the gaseous state, which is FAR less dense than CO2 in the liquid state as found in a pressurized tank at 800PSI. So it really won't hold much CO2. And as you use it, the pressure would constantly be dropping, so you'd need a regulator to ensure a constant flow - for a setup that would probably run less than a day. Plus, while a brand new soda bottle may reliably survive a one-time pressurization to 90PSI, I definitely wouldn't do it on a day-to-day basis!

But this has me wondering about something else. I've heard you cannot drive an "atomic" style diffuser with DIY. Why not?
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post #15 of 17 (permalink) Old 02-08-2013, 05:09 PM
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One of my other "hobbies" is making soda. I use the tire valve stem into a 2l bottle cap method for carbonation.

I usually set my regulator around 80 PSI to carbonate the soda. My regulator is a cheap tool regulator, so I really don't know how accurate it is.

As for of filling a 2l with pressurized CO2, I doubt it would last more than a day. You probably would get the same effect as tapping a bottle of seltzer water.
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