👉 The adapter fluid, also known as an interface fluid or sealant, is a specialized lubricant and sealant used to facilitate the smooth operation of various mechanical systems by filling gaps between mating surfaces, such as those found in hydraulic systems, gearboxes, and engine components. It serves multiple functions: it reduces friction between moving parts, prevents leaks of hydraulic fluids or other working fluids, and provides a barrier against contaminants like dirt and moisture. Typically composed of synthetic oils or specialized polymers, adapter fluid is designed to maintain its properties under extreme temperatures and pressures, ensuring reliable performance and longevity of the system it is integrated into.