Designed to mask the interior of a part tunnel and multi-level counter sink holes, the Mating Plug combines metal and rubber. The plug is made from material able to withstand high temperature finishing processes such as powder coating, plating and e-coating. The ability to screw the flanged plug to its mate creates the air tight seal necessary for e-coating applications. The plug was designed to be user friendly. The turn tabs on the plug ends allow for easy application and removal, while screwing the pieces together ensures an air tight seal. The lip on the rim of the plug guarantees the multi-level counter sink holes are also protected.