Corny Keg Dip Tube Thermowell

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FunkedOut

FunkedOver
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Found a very nice $12 thermowell that will fit in place of a dip tube with just a touch of diy.
This is the unit I bought here:
https://www.brewershardware.com/16-...l?category_id=259#product-details-tab-reviews

Here it is next to a dip tube:
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745F2144-CDBE-4197-90E8-6F9C1C77BBD5.jpeg


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In my case, I plan to weld a post/dip tube nipple on a keg lid to use on 10 gallon corny’s.
The thermowell is 16” long, which should reach down to just above 3 gallons of liquid and not touch it. 4 gallons would submerge ~1.5” of the tip, 5 gallons ~3.5”.
(The 10 gallon corny’s are just about the same height as the 5 gallon ball lock, so if you divide those volumes in half, you get a pretty good idea of how this will work in a common 5 gallon keg.)
(Moving from the lid to the existing posts will buy you another ~1/2” or so.)

The exterior diameter (5/16”) is a great fit and slides right into a keg.
The interior diameter (1/4”) is big enough to fit the inkbird probes I use for controlling the fermentation chamber.

The only diy needed is to enlarge the flare enough to seal with an o-ring and post.
As is, the diameter is only 0.365” and is too small for the ledge on the post that tightens the flange against the o-ring.
Dip tube flanges are ~0.500” although I have a few down in the 0.485” range.
 
I borrowed a 45* flaring/swaging tool from a friend, so I don’t have a or of info about it.
Here are some pics:
FF7AD726-3259-4AA1-8E8D-6C26DB073437.jpeg


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If you pay attention to the instructions, you’ll find I’m not using this tool as intended.
I’ll be using the 5/16” size.
7312AE52-6B02-4144-9F2F-AE3966AA8402.jpeg


5D15A8AF-9B4F-494C-B73B-52FD8FD1FF66.jpeg


Leaving about 1/8” sticking out.
2FA11C97-7A0E-41AE-9DF9-8A98AD597027.jpeg


Using the flaring tip first...
20EBBDA7-00AC-4E4A-8F83-A60D27A8D9B8.jpeg


A49055BE-24AC-45E1-8B66-01C44A5B6CE0.jpeg


...then the flat die.
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83C03028-BEBB-4C4D-8E98-D7B33DBD3095.jpeg
 
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By no means is this a perfect match for a dip tube flange, but it works.
I’ve tested it to hold as little as 1 psi, as much as 60psi and everything in between.
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Fits right in the keg.
944FAFF8-AF2E-4114-818D-92B1B55DAB8E.jpeg


Fits right in the post.
0F995E0E-D8F1-405A-9A2C-5CD9510B9104.jpeg


A little polish to remove the tool marks and done!
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I can't edit the posts above any longer, but need to correct where I wrote to leave 1/8" sticking out of the flaring tool.
It's actually 1/16". The picture is right, my text is wrong.
 
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