I don't know about tygon because I can't get that stuff in Slovenia, I only know that OD must be 12mm for hose for this fitting and not aprox. 12mm. But I think I know what I'll use in the future, for this fittings, I'll put 5cm of that plastic pneumatic hose and put it in my 1/2" silicon hose where it fit perfectly, and tighten it with hose clamp, like you see when going from rad to cpu block (silicon hose to 90° elbow quick fitting), that way I can use those fittings and 1/2" silicon hoses without any reduction in cross section comparing to normal brass fitting because the ID is the same for both fittings
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