Help finishing Co2 reactor build - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 01-29-2013, 11:06 PM Thread Starter
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Help finishing Co2 reactor build

I started building a Rex-Griggs style CO2 reactor, but I need help with sealing the two air-line ports on the top..

Sorry for the mspaint picture, but I'm away on my laptop for the day, and I don't have a way to take pictures.

here's what I built with 2" PVC -



After gluing it all together, I drilled two holes in the top for the CO2 intake and for a "release valve" (per some forum post I remember reading here)..

Now, the tube doesn't seal in the hole perfectly, so how do I seal it up? I tried squeezing a mess of silicone around it, but it still leaked on me...

Do I need to start over and glue it from the inside?
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post #2 of 5 (permalink) Old 01-29-2013, 11:07 PM Thread Starter
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Forgot to mention, the "cap" where the two holes are drilled is rather awkwardly shaped:

It's like a drinking cup with ridges inside of it and a domed bottom, very tight to work inside of.
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post #3 of 5 (permalink) Old 01-30-2013, 12:08 AM
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If you can, get a 1/8" NPT to 1/8" barb adapter. Then drill a 3/8" hole, wrap some teflon tape around the adapter threads, and screw it in. The 1/8" NPT threads are just a bit larger than the 3/8" (actual size) hole, so it fits nice and snug.

I originally found the adapters at Ace, as neither Lowes or HD had 1/8" NPT, only 1/4" NPT. And, if you can wait a few days, they're also readily available via Evilbay.
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post #4 of 5 (permalink) Old 01-30-2013, 01:25 AM Thread Starter
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post #5 of 5 (permalink) Old 01-30-2013, 02:03 AM
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You can also use compression fittings (1/4" compression to 1/8" NPT) instead of the barb, by the way. Though, if you have barbs in other places along the line, there's no real point except to make that particular tubing-to-fitting connection more secure.
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