Though several hydraulic fittings are often mistaken to be hydraulic adapters, they are not the same. Though there are several fittings that are referred to as hydraulic fittings, hydraulic adapters are specific components used for joining two or more threads. The size and forms of these threads are different from each other. These hydraulic adapters are useful in maintaining the fluid strength and avoiding any leakage of fluids. In order to choose the right hydraulic adapter for your system, do keep in mind the materials of other components as well as the type and pressure of the fluid so as to ensure the right choice.