I just wanted to pass this info forward to anyone that may have this same question as I did. I did reached out to AquaComputer support as well to see if they had an idea what I needed. They did reply, and also provide a solution for me thank you and appreciate the support.
Here is there reply:
Hello Antonio,
this seems to be an early variant that used G1/8 fittings.
The thread of G1/8 fitting has a diameter of about 9.6mm while for G1/4 it is about 12.9mm.
You could get G1/8 fittings to match your tubing size or you have to use a G1/8 to G1/4 adapter.
kind regards
Sven Hanisch
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Sven Hanisch
Vertrieb/Sales
Aqua Computer GmbH & Co. KG
Gelliehäuser Str. 1
37130 Gleichen
Germany