Sierra 18-5231-1 Premium Marine Spark Plug Wire 9 Inch

The Sierra 18-5231-1 is a premium 9-inch marine spark plug wire designed specifically for demanding marine environments. Engineered for Thunderbolt-type ignition systems, this spark plug wire delivers reliable performance and maximum durability in harsh saltwater and freshwater conditions.

Key Features:

• Magnetic suppression core manufactured for specific marine applications
• Kevlar® reinforced core provides exceptional durability and extended service life
• Durable stainless steel wound conductor maximizes horsepower and engine performance
• Premium silicone jacketing and boots withstand extreme high temperaturesSuperior RFI suppression protects sensitive marine electronic systems
• Corrosion-resistant stainless steel terminals ensure maximum conductivity in marine environments
• OE-style boots create a sealed barrier against heat, dirt, and moisture intrusion
• Compatible with Thunderbolt-type ignition systems

This 9-inch spark plug wire is built to withstand the unique challenges of marine applications, from temperature extremes to constant exposure to moisture and salt spray. The combination of Kevlar® core strength and premium silicone protection ensures reliable ignition performance and long-lasting durability for your marine engine.