The 125-1131-403 is a red indicator cap designed for use with the 125 series of oiltight panel mount indicators. It is constructed from durable polycarbonate with a chrome-plated brass bezel, providing a robust and finished appearance. This cap is specifically designed for indicator bases that mount into an 11/16-inch panel hole. As a component of a complete indicator assembly, it is suitable for providing clear visual status in industrial control panels and equipment where an oiltight seal is necessary.