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Old 04-14-2013, 07:37 PM   #1
spaceyaquarius
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Default What inside diameter is for ball lock barbs?

I have a ball lock barb fitting that looks exactly like this


It's hard to get the exact measurement. I know it's bigger than 3/16", and I measured my lines and it looks like the inner diameter is either 1/4" or 5/16". And the outer diameter looks like it is 1/2" or just under.

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Old 04-14-2013, 08:07 PM   #2
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The coupling has a 1/4" flare thread.
Unless you're running your beer lines a long way, you should use 3/16" ID lines.
Gas can be anything that fits your plumbing bits...

Cheers!

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Old 04-15-2013, 12:50 AM   #3
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Quote:
Originally Posted by day_trippr View Post
The coupling has a 1/4" flare thread.
Unless you're running your beer lines a long way, you should use 3/16" ID lines.
Gas can be anything that fits your plumbing bits...

Cheers!
I thought that the photo above shows a barb thread. It looks larger than 3/16" to me. I think it may be 1/4"???
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Old 04-15-2013, 02:55 AM   #4
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Quote:
Originally Posted by spaceyaquarius View Post
I thought that the photo above shows a barb thread. It looks larger than 3/16" to me. I think it may be 1/4"???
Which part of "The coupling has a 1/4" flare thread." didn't register the first time?

Cheers!

[edit]
ps: "barb thread" does not compute.
You have a flare thread that accepts a FFL fitting - which has a barb and a swivel nut, and looks like this:

The tubing goes on that barb, not on the flare threaded disconnect.

A barbed QD looks like this:

You slip tubing directly on this style of fitting...
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Old 04-15-2013, 04:11 AM   #5
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Quote:
Originally Posted by day_trippr View Post
Which part of "The coupling has a 1/4" flare thread." didn't register the first time?
Ouch. Me no think so good sometime.

The fittings on my keg are different, it's just a ball lock quick disconnect that doesn't have a barb or flare from what I can tell, and the beer lines will not disconnect (they're clamped on permanently).

I bought separate parts so I can attach new and longer beer lines. I had the parts I needed in a bag but I guess I was too dumb to figure out how to put them together. It looks like I have parts to make a 3/16" barb QD and also a 1/4" barb QD.

I've read from several posts that home brewers here prefer 3/16" inner diameter beer lines.


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Old 04-15-2013, 06:33 PM   #6
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I still don't get the question.

Your disconnects have flare fittings (1/4" MFL). This is a type of threaded fitting, it is not a barb.

In the bottom two pictures, it looks like you have swivel nuts (basically a barb to flare adapter) installed into the MFL disconnect.

The advantage of MFL is that you can easily swap between a commercial keg coupler (with MFL fittings) and your ball lock kegs. Make sure you don't overtighten (just barely snug with a 9/16" wrench) and make sure you use a nylon washer when it's a metal-to-metal fitting, like on a sankey coupler.

I hope Keg Connection doesn't mind me linking to their pictures.

Ball lock QD with barb:


Ball lock QD with MFL:


Swivel nut (FFL to barb):


Sankey coupler with barb (on the gas side):


Sankey coupler with MFLs:


Nylon washers that you need for those Sankey couplers:


Most beer barbs are 1/4", and a 3/16" ID tube can be stretched over it. It does look like the one on your black QD is larger so you might need a smaller swivel nut. Your beer line should be 3/16" ID unless you have a long run or big vertical rise. Gas doesn't matter.

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Old 04-15-2013, 07:18 PM   #7
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Quote:
Originally Posted by zachattack View Post
I still don't get the question.[…]
Seems the OP has some old lines and he doesn't realize the disconnects that are clamped on are barb type...

Cheers!
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Old 04-15-2013, 07:48 PM   #8
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The question was already answered last night. Thanks though.

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