Mercury Marine NGK ITR4A-15 Laser Iridium Spark Plug

NGK ITR4A‑15 Laser Iridium spark plugs come pre‑gapped to your engine manufacturer’s specifications and are engineered to deliver long service life, strong ignition performance, and excellent heat transfer. Built with NGK’s fine‑wire iridium center electrode and high‑strength ceramic insulator, they help improve fuel efficiency, reduce fouling, and maintain reliable operation in marine environments.

Features

• Pre‑gapped to match your engine manufacturer’s specifications
• Fine‑wire Laser Iridium center electrode for slow wear, stable idle, and improved fuel efficiency
• NGK trivalent metal plating provides superior anti‑corrosion and anti‑seize protection in marine conditions
• Copper core and ribbed suppressor seal enhance durability, heat dissipation, and misfire resistance
• Pure alumina‑silicate ceramic insulator offers high strength and excellent heat transfer
• Replace all spark plugs at the same time for consistent performance
• Always use the spark plug recommended in your engine’s owner’s manual

Product availability varies between locations, and some products are only available online. Please contact your nearest Martin Motor Sports here for availability.