Sierra MP52000 Mercury Ignition Switch 3 Position Sierra MP52000 Mercury Ignition Switch is a direct OEM replacement, making installation easy. Ideal for DFI, EFI and MPI engines Heavy duty potted construction Minimal bleed per circuit Molded umbrella type key Push to choke Maximum corrosion protection - eliminates oxidation Inner seal between cylinder lock and contact plate Non-conductive housing eliminates potential shorts Specifications Back Up Nut Plastic Face Nut Hex Black Plastic Hole Size