Radial shaft seal is a sealant used for sealing a rotary shaft and fluid-containing shell to prevent fluid leakage from outside the crust. In fact, the “bowl” is a piece of three pieces of spring, a metal bowl and a compressed felt that prevents fluid leakage in mechanical parts, but today, each of the rubber gaskets in different sizes, which are used in various mechanical devices such as motors The car is used to prevent oil penetration. It is commonly referred to as emulsion.

Earthenware or the same sealing kit is usually made of teflon to prevent corrosion of its components.

The piston serves as a propeller inside a metal tube closed with a hydraulic fluid (generally oil). Around the place where the rod moves into and out of the enclosure is fully sealed by an epiploon and the fluid under pressure does not have the ability to leave the compartment. Cascade failure causes oil leakage from the aid, when the leakage of shock absorbers is seen, the time for replacement.