Just adding a tidbit... What you have there in the pic Hara is NOT a quickconnect fitting...
The picture shows a straigth barb with a locking ring, put the tube on and tighthen the ring, no need for a clamp to secure it... And that one is not anymore restrictive than any other barb, because the internal diameter is the same for the same size of tubing... It's a bit more bulky on the outside thoo...
A quickconnect fitting is more restrictive than a straigth barb undoubtedly... how much is dependent on the construction... there are ones supposed to be "less" restrictive then a "normal" quickfitting... dunno how much difference it makes thoo...
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