U51251 is a silicone sealing boot designed for double sealing applications on IR series panel switches. The boot features a transparent silicone construction with a diameter of 21.40 mm and a height of 9.80 mm, providing excellent protection against environmental contaminants. It operates reliably across a wide temperature range of -40°C to +85°C, demonstrating superior elasticity and temperature performance characteristic of silicone materials. The boot prevents dust, sand, and water from entering switches while maintaining compatibility with front sealing options. This product is ideal for applications requiring enhanced environmental protection in harsh or wet conditions, and the flat seal or O-ring supplied with the switch should not be used with this boot.