The 125-1137-403 is a clear cap designed for use with the 125 series of oiltight panel mount indicators. Constructed from durable polycarbonate, it features a chrome-plated brass bezel for a secure and finished appearance. This component is part of an assembly that fits an 11/16-inch mounting hole and is compatible with bases using T 3 1/4 miniature bayonet base neon lamps. Its oiltight design makes it suitable for industrial control panels, machinery, and other applications where resistance to contaminants is necessary, while the clear lens provides maximum visibility of the indicator status.