Sproket, Using poly barbs is'nt necisary at all, Brass is'nt
thatdisimular from copper, not enough to make corrosion promblematic, (or even noticable). But then again brass is'nt needed for strenght in H2o rigs, it's more for airhose pressure or chemical/petroleum usage. Anything that overcomes the inherant restriction of 'Barbs' should be used, if they have a bigger i/d then use them. I'd solder copper 13mm pipe to my rad personaly, huge 13mm i/d for flow!

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A PS to PR,
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When those temps rise and that consendation turn to water then what. Drip Drip Drip.
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Condensation only happens at low temps, when the temp rises it called evaporation...