'AN' fittings refer to a style or thread form used by the army/navy in USA, JIC fittings are just a different style and thread form and format. To be honest the specifics are probably best left to the hydraulics guys to resolve as some fittings are tapered and others flat faced with 'o rings' etc. if you take the coolers down to a hose fitting guy he will know exactly what works with what.






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