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Old 02-01-2013, 03:55 PM   #1
Apr 2012
Northville, MI
Posts: 12

I see coils of 3/8ths copper tubing. Some are labled where 3/8ths is the inner diameter and some where its the outer diameter.

So, with all the posts on this site debating 3/8ths vs 1/2 inch, are people debating outer diameters or inner?

In other words, I can buy either. I want to know which size the homebrewers have been talking about all these years.

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Old 02-01-2013, 04:15 PM   #2
Misplaced_Canuck's Avatar
Jan 2011
NE Columbia SC - Formerly, Montreal Canada
Posts: 2,886
Liked 166 Times on 134 Posts

Copper is not that thick. Using 3/8" ID tube is gonna be very similar to 3/8" OD tube (if that exists).

Originally Posted by Misplaced_Canuck
Carbonic bite? Is that like the bubonic plague?
Originally Posted by ebstauffer
Needless to say after more than a few drams my mental efficiency matched my mashing efficiency.

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Old 02-01-2013, 04:23 PM   #3
Sep 2012
Ann Arbor, Michigan
Posts: 2,543
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I believe the walls of mine are 1/32" thick.

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Old 02-01-2013, 04:23 PM   #4
Dec 2009
Posts: 1,883
Liked 159 Times on 135 Posts

The general rule in the trade is, tubing is specified by OD, and pipe is specified by ID. So 3/8 copper tubing will have an OD of 3/8", but 3/8 pipe will have a larger OD. Also, tubing will be closer to the nominal dimension than pipe will.

The key is that if you buy tubing, buy tube fittings. If you buy pipe, buy pipe fittings.
"Anything worth doing, is worth doing slowly." ~~ Mae West

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