Just purchased a regulator... - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-07-2007, 10:33 PM Thread Starter
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Question Just purchased a regulator...

I just purchased a CO2/Argon regulator. I am pretty clueless with all the CO2 stuff though, so I have a few questions. I removed the pipe nipple that the hose barb attaches too from the regulator as is suggested on rex's website. Upon removal I notice this nipple is around 1/2" not a 1/4" and the end that goes into the regulator is completely closed except for a small pin hole. This brings me to my first question. Can I still use this regulator with the appropriate reducers, or is it too big? I also notice that the one gauge that measures the flow is in CFH, witch I am not really familiar with. Can I just get a different gauge?

Help! I am clueless!
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post #2 of 5 (permalink) Old 10-08-2007, 03:23 AM
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The port is a 1/4" NPT port. See this chart to clarify it.
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post #3 of 5 (permalink) Old 10-08-2007, 06:32 AM Thread Starter
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Well Rex I looked at the chart and I am still not sure I understand and I kinda feel stupid...

With the regulator I purchased the O.D of the nipple is 1/2" while the I.D. is indeed 1/4". Looking at your web site I was under the impression the reducer you used to mate with the port on the regulator was 1/4" O.D. and an 1/8" I.D. Am I totally lost here, or am I going to need a 1/2"-1/4" reducer followed by another 1/4"-1/8" reducer in order to use the 1/8" pipe nipple? I don't really care if I have to add two reducers instead of only one, but I wasn't sure if it is ok to do.

I am sorry, I wish I could explain this more clearly, or show some pictures of my regulator.
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post #4 of 5 (permalink) Old 10-08-2007, 12:36 PM
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Don't feel bad, when it comes to tubing and plumbing it can get very confusing as to when they are talking about I.D. or O.D. because they don't always specify and just assume your application is the same as theirs. When it comes to NPT threads they are refering to the inside diameter of the pipe the threaded end is intended to mate with, and the O.D. of a 1/4" NPT thread is about 1/2". You can buy connectors that have 1/4" NPT on one side and a barbed connector on the other side that will fit most any size I.D. tubing. Most places that sell plumbing supplies will have these type of connectors. What I often do is take the old fitting with me to Home Depot and a short piece of the tubing and look for a connector what will connect one to the other. This way you have them with you to compare, or to show someone else who offers to help you.

As for your flow rate gauge, it is fairly useless and unnecessary for our application as your flow rate will probably be way too low to even register on it which is why most hobbiests measure their flow rate in bubbles per minute which is not terribly exact, but it doesn't need to be an exact accurate measurement just a consistant one.
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post #5 of 5 (permalink) Old 10-08-2007, 01:54 PM
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A 1/4" NPT port is just over 1/2" in diameter.

As stated by vidiots you can't simply measure ID and/or OD and know the thread size......unless you are familiar with NPT sizes. A 1/2" NPT port is 0.84"

I use a 1/4 to 1/8 reduction nipple on my regulator builds now. Saves time and eliminates a potential leak. I used to use a 1/4 to 1/8 bushing and then a 1/8 hex nipple.
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