The Blue Sea Systems Lockout Slide allows only one of a pair of double pole AC circuit breakers to be activated at a time. This guarantees that AC power from 2 sources (power company and genset or inverter) will not be mixed. Fits all double pole C-Series circuit breakers. Uses circuit breaker mounting screw holes. Requires no special panel modifications. Includes mounting screws.• 2 Positions• 2 PolesBlue Sea Systems No. 4130 Fits C-Series circuit breakers Requires no panel modification Includes mounting screws | Lockout Slide, C-Series, 2 positions, 2 poles