Rubber plugs are shaped and formed to fit their use. They are normally used for equipment that need their joints and edges covered. In special situations, they are used to cover wires that are part of a machine’s intake wiring. The various types of rubber plugs include plus, T, washer, and connector.
Plus plugs hold equipment together, T-plugs are designed to be inserted into various types of tubing, washer plugs function like T-plugs but extend out to cover the area surrounding the hole where they are inserted, and electrical connector plugs protect female threaded connectors from contamination by moisture or dust.