The term 'Rubber Ring' can be solved by the 6-letter word 'GASKET'. A GASKET is a mechanical seal which fills the space between two or more mating surfaces, generally to prevent leakage from or into the joined objects while under compression. Gaskets are commonly produced by cutting from sheet materials, such as paper, rubber, silicone, metal, cork, felt, neoprene, nitrile rubber, fiberglass, and a variety of other materials. Rubber rings are a type of GASKET made from rubber, and are used in a variety of applications.