The 812-0975 is a white, translucent indicator cap designed for the 812 series of press-to-test panel mount indicators. Made from high-impact plastic, this cap is used with a base that accommodates a T-1 3/4 midget flange base incandescent or based LED lamp. The complete assembly is designed for a 15/32-inch mounting hole and supports a voltage range of 1.35V to 28V. The press-to-test feature allows for convenient lamp testing, making it suitable for critical status indication in industrial control panels and instrumentation.