Gaskets, washers and O-rings are all important components used to create tight connections and prevent leaks in various mechanical systems and applications. The advantage of gaskets is that they can be adapted to different purposes and work under different pressures and temperatures. Washers provide several benefits, including distributing pressure evenly, reducing friction, and protecting the mating surfaces from damage. O-rings are used in round sealing applications and are placed in a groove to create a tight seal. The advantages of O-rings are their versatility, ability to withstand different temperatures and chemical exposures.