Nylon is a very good material to use, I use nylon and PVC for all the fittings in my Chip-Chillers, they give excellent reliability and they flow very well.... I do however prefer the Brass on the block approach, but mainly for performance purposes. you see the inside surface area of a brass fitting adds to the total heated area of the block, giving me even more performance. This is however so small a difference, at best I can only refer to it in a theoretical way,
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