IQ Series has integral bonded concentric aluminum nut that screws directly onto, and completely surrounds, existing front-panel switch bushing-nut. Environmental switch and circuit breaker silicone sealing boots have round base and provide protection to IP66/68 against hostile contaminants that can invade and corrode internal contacts. Conforming toggle design fits switches/breakers with 15/32-32 bushing, requiring 0.975 in. boot height.