Heavy Wall Self Locking Thread Insert, 1/2"-20 Int Thrd Sz, Carbon Steel, 5 PKMfr #: 329 820 PK5 Rareelectrical Brand Compatible with CAT, MERCURY. Please verify your OEM part number from your original unit to help ensure fitment. Replaces: Arco Sw 099 Sw099mercury Marine 89 818999A1 89 818999A2 89 825842A1 89 850188A1 89 850188Ta 89818999A1 89818999A2 89825842A1 89850188A1 89850188Ta 89 818997A1 89818997A1 89 818997T1 89818997T1sierra 18 5820 185820Part Type Solenoid Relayvoltage 12Short Description 12 Volt 4 Terminal Isolated