Silicone rubber boot, with molded-in mounting nut, completely covers actuator. Units seal both switch and panel-cutout in which switch is mounted. Tolerant to sunlight, weather, salt-spray, ozone, most acids and cleaning solvents. Units RFI suffix are EMI shielded. Meet MIL-B-5423. UL recognized. CSA certified. 50000 actuations (Min.) operational life.