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PEX pipe for outer shell of counterflow chiller?

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Looking back I could have saved money on a 30 plate chiller. My thought was to save money because I already had the 3/4 pex but now I am going to add another 30' of copper and a couple more fittings and that will put me right under $100 for the chiller.

The copper bands are the rings that compress and seal the PEX. This is the same thing I would use if I was going to run a water line in a house. The only difference is the PEX has a 3/8 copper water line running inside of it.

Now that I have it I will continue to use it, I guess home grown is not always cheaper, but it was still fun to build!
 
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