Sierra 18-6438 Replacement Mercury Outboard StarterSierra outboard starters are designed for spark/ignition protection to prevent ignition of fuel vapor contained within the bilge of a boat. Each Sierra starter is sealed to prevent water intrusion and corrosion. Replacement starter for Mercury Outboards. Fits 30, 40 HP 3 Cyl 4-Stroke 0G760300 & Up. Assembled using high-quality corrosion resistant materials; Interchangeable with: Arco; 5365; Mallory; 9-15018; Mercury Marine; 50-859170T; 50-888160T; 50-854636T; 50-884045T; 50-893887T; 50-859170T1;