JIC fittings are widely used in fluid applications such as the delivery of fuel or hydraulics, expecially when a higher PSI is involved. The JIC fitting uses its 37-degree chamfer seating surface to seal rather than an o-ring that could corrode. This allows them to be connected and disconnected repeatedly, such as hydraulic applications, without concern for deformation.
JIC fittings are very similar to Army-Navy fittings but with a lower tolerance and therefore are produced at a lower cost. Commonly made out of stainless steel, the hoses makes connecting and disconnecting quick and easy, and the NPT to JIC adapters allow most connections to be easily converted to a JIC system. Maintenance, particularly with stainless steel fittings is very low, and costs are usually isolated to a replacing a damaged component instead of the entire system.