The body of the hot melt plug cover is generally nylon, and the peripheral ring is designed with EVA hot melt adhesive, which is stuck into the sheet metal hole before baking in the medium coating, and the hot melt adhesive will stick the plug cover and the sheet metal together after baking and heating, and the melting temperature of the EVA adhesive ring is generally 140℃-180℃. Ordinary plug cover is installed in the assembly workshop, and the sheet metal hole is stuck together by interference fit.