question about 12.7/7.6 fittings with 11/8 system

[BobbyBoyGaming]

Hello,

I have a system that uses 11/8 fittings (5/16 inch ID), however, ever since you stopped shipping to America I can no longer find these fittings in the USA market.
I cannot find these in the USA at the moment:


The closest I can find is this:

Has anybody tested these barbed ES 12.7/7.6 fittings with 11/8 EPDM tubing and tight hose clamps like these ones?



For use with this tube:

 

[BobbyBoyGaming]

Is there an Alphacool store staff member that could very quickly test this combination of fitting and tube (and clamp if you have it) to see if it is water-tight?