The U187 is a silicone sealing boot designed for AV series pushbutton or rocker switches with a 19 mm bushing diameter. This protective boot prevents dust, sand, and water ingress into the switch mechanism while maintaining accessibility and ease of operation. The boot is manufactured from silicone material, offering excellent performance across a wide operating temperature range of -40°C to +85°C with superior elasticity and low-temperature flexibility. Available in seven color options—black, green, grey, yellow, red, white, and transparent—the U187 provides both functional protection and aesthetic customization for industrial control panels and equipment. The compact design with a 23 mm outer diameter and 4.1 mm height ensures minimal panel space consumption while delivering reliable long-term sealing performance in demanding environments.