Emergency Engine Cut-Off Switch w/ Coiled Lanyard | Sierra MP40970-1 Sierra Emergency Engine Cut-Off Switch w/ Coiled Lanyard | MP40970-1 Sierra emergency cut-off switch and lanyard 4 terminal switch for either normally open or normally closed operation Works with conventional or magneto ignitions Fits panels up to 1/4 in. thick Design keeps plunger down when lanyard is connected Designed to keep out moisture Replaces Sierra MP40970