Boat owners and marine mechanics, these Narcilors spark plug wires are exactly what you need to keep your Mercury, Mariner, or Chrysler Force engines running smoothly. This 3-pack replaces part number 18-8819-1 and includes an air gap gauge to make installation even easier. The 7-inch length and 7mm diameter are perfect fits for many marine engines. What makes these wires special is the Kevlar core - that's serious durability that stands up to the harsh marine environment. The stainless steel wound conductor isn't just corrosion-resistant; it actually helps maximize horsepower and engine performance. The premium silicone jacketing and boots provide ultimate protection against high temperatures under the hood. Installation is straightforward - these are direct replacements that fit exactly where your old wires went. The reliable performance means you can head out on the water with confidence, knowing your ignition system is in top shape. Whether you're doing routine maintenance or troubleshooting performance issues, quality spark plug wires make a noticeable difference in how your engine runs. The package includes everything you need for a complete tune-up on one engine. Don't let old, worn-out spark plug wires leave you stranded - upgrade to these quality replacements and enjoy smoother idling, better fuel efficiency, and reliable starts every time you turn the key.