The original post: /r/watercooling by /u/schmoorglschwein on 2024-12-28 14:42:55.

Hi folks,

I managed to source EKWB ZMT tubing and was quite happy about not having to replace all my fittings, and when the package arrived today I thought the tubing looked a bit too small. I measured it, and true enough, it’s 10mm ID. Contacted the seller, and that was the last they had in stock. They offered me a refund, but they don’t have any ZMT left in any size.

I’ve tried to force it on to the 7/16" fittings and it’s a very tight fit. It works, but putting the compression fitting over the tubing is much more difficult, and I’m afraid it would just rotate the G1/4 size and eventually break the fitting on the block before I get it closed. Having said that, it doesn’t come off easily, so I could just loosely close the compression fitting and leave it like that.

There are no markings on the tubing except “EKWB”. I’ve measured 10.01mm ID. When I measured my Primochill tubing which is supposedly the same size, I get 11.12mm, which is what 7/16" is supposed to be. I know that EKWB makes a 10/16mm ZMT tubing as well, so I figure they just sent me the wrong one, honest mistake, but no chance to get the correct tubing.

Is anyone running 10/16mm tubing over 7/16" fittings? I don’t know if it will break in the long run. Not sure whether to go back to my old tubing, or keep this and hope for the best.