How do I connect the Fabco needle valve to a diffuser?

Are you using regular airline type tubing? If so look for 1/8 npt to 1/8 barb fittings...a few bucks a piece online. I dont see them on hd/lowes sites but I know have fittings in the store they don't list online.

The needle valve has a 3/8 connection. Haven't been able to find anything under 1/4 inch

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You have a 3/8" port nv 55 18? If it was a mistype and you meant 1/8....E bay #121195260464

decemberwind said:

The needle valve has a 3/8 connection. Haven't been able to find anything under 1/4 inch

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Click to expand...

You better double check what you have, what you need, and what you're trying to do. 3/8 is bigger than 1/4; and as noted by others chances are you're looking for 1/8.

Something like this should work:https://www.amazon.com/Anderson-Metals-57001-Fitting-Connector/dp/B000BQKDPA?th=1

The real problem right now is finding a way to connect the airline to it cause nothing apparently works on soft tubing

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Ok, so you're trying to go from the 1/8" nv to your 3/8" bubble counter?What home improvement store do you have there?

If you're looking for a quick solution that the parts are usually available locally(for me at least)
these two should get you connected back for now until you decide how you want it hooked up.

https://www.fastenal.com/products/details/69897

https://www.amazon.com/LTWFITTING-B...d=1484852132&sr=1-4&keywords=1/4+npt+1/8+barb

Where in TO are you.
i may be able to point you as to what & where to get a fitting.
If you prefer PM works too.
Regards

jeffkrol said:

1/8 pipe is .405" outside diameter..roughly 3/8..Confusing od w/ id..
Fabco takes 1/8" pipe..

Seems the easiest thing it to join the old valve to the new one (should be 1/8 since the fabco fits where it ued to be....just run it full open.

Those bubble counters are usually "dual use" w/ either pipe fittings or tubing..


EDIT: didn't notice the fabco was "right angle".. complicates the above..

Click to expand...

K so the invoice says 1/8 could swear the guy said 3/8 at the time but whatever. The problem with your suggestion is the the old needle valve is stuck shut which is what finally motivated me to replace it with one that hadn't gassed my tank 2 twice in the past

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Nice job. I honestly think that swagelok fitting you are using is one of the most secure ways to go for transitioning from the needle valve to flexible tubing. Just be sure to include the tubing insert (stiffener) with it. https://www.swagelok.com/en/catalog/Product/Detail?part=SS-405-2

Oh for [censored][censored][censored][censored]s sake you mean I could have used one of these to convert it to a different sized fitting? Why has no one told me about these things. Also no I don't have one of those

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The most common size we would use for our intentions is the 1/4" tube fitting on one end, 1/8 or 1/4 male/female NPT on the other end. If you use 1/4"OD 1/8"ID tubing, these are great and extremely secure. The additional insert part I listed acts as a stiffener for the flexible tube. Without it, the swagelok fitting has nothing rigid to compress upon. You might find yourself leak-free now, but down the road when the flexible tubing gives in and deforms due to the unequal force exerted upon it, it will most likely leak. At which point you either cut your tubing back and insert a fresh section, or be done with it forever with a tubing insert.

Sounds goods. Can probably take my time as it's really thick walled tubing but the guy told me not to take the compression cap off so how would I get the head to that part underneath it?

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I take mine apart all the time on my flex tubing because I swap regs frequently (testing new ones I get in). Note: I don't tighten mine 100% like I would with rigid tubing due to the relatively low pressures we use. Take a look at this image to see what's most likely inside. I say most likely because these are the parts swagelok and their clones usually use.
https://goo.gl/images/p57wyO

If you have a standard compression fitting from something like a plumbing supply place, it'll look like this.
https://goo.gl/images/Is5WHG
Notice they have a stiffener in there.

Usually with flexible tubing you never have to snug down so hard that the inner compression ring completely deforms and becomes unusable if you loosen the fitting, but still get a gas tight seal. If you're confident your tubing is rather resilient, then don't sweat it and you might be fine. The stiffener is used to make flex tubing "rigid" and let the fitting compress on the tubing without deformation.