Coaxial heat exchanger fittings

[DetroitAC]

So, I need to build myself a coaxial heat exchanger with 1/4 tubing inside 3/8 tubing. I see in the catalogs that a copper reducer tee exists, down to the ref store, the guy only has one fitting on the shelf,I take it, he'll get some more from other stores sent over. Next day, they went to the wrong stores, but there were only a few of them to begin with, so they had to come from many separate stores. Anyway, they'll be in on Tuesday, so I tell the guy to forget it, and I machine my own (write the CNC code so I can make them easily next time).

What gives? I see a lot of builders here just sort of squishing down larger sized tees instead of using reducing tees. Are these hard to come by everywhere? Had I known I would have ordered them in advance...

[n00b 0f l337]

They seem to be, not everyone has a CNC.

[jinu117]

Is that stainless steel?
Pretty I wouldn't want to braze it up to make it look worse lol.
Yes they are bit harder to look for or too pricey. Now... another thing I can make out of CNC machine when it shows up Worth it? No idea. Fun, I guess... :P
I kind of moved away from coaxial HX though.. hehe.

[wdrzal]

parts are easy to come by from a refrigeration shop. shoping at home depot or lowes sells plumbinging parts. refrigeration uses od and plumbing id as I,m sure you know. crunching down fittings is just lack of professional workmanship.

They make a tool that is a tube cutter but with a rounded dull wheel that will make nice fitting reducers to a certian degree, its rolls the larger size closed over the smaller size with out cutting the tube. or you expand the smaller size with a swag tool. they also have a tool to make your own tees or manifolds.

[DetroitAC]

Is that stainless steel?

Nah, that's just brass before it has had a chance to tarnish.

[bazx]

these tees can be found here in the UK from climate centre if you get stuck
i can send some over

although you cnc units look very cool

[Unknown_road]

over here: http://www.bes.ltd.uk/ under ref & aircon-> end feed fittings

bottom of the page press "next page" 2 times.