Trustworthy, high-quality plugs, 86-3710 B7S Spark Plug. It fits Mercury Marine outboard and inboard engines. They are Patented triple gasket sealing that prevents the escape of combustion gas. NGK spark plugs work over a broader temperature range than standard spark plugs. . The construction of NGK standard plugs is optimized for durability and performance. Key Features: Trivalent metal plating provides exceptional anti-corrosion and anti-seizing qualities. Designed to match or surpass the performance of OEM spark plugs Ribs that are corrugated avoid flashover. Alumina silicate insulation is strong and thermally conductive. The copper core facilitates heat dissipation. Triple sealing prevents water infiltration The longer nose of the insulator reduces fouling and misfiring. Resistant to carbon accumulation and ignition Specifications: Brand: Autowares SKU: 86-3710 Weight: 0.15 LBS Unit Of Measure: EA Manufacturer Part Number (MPN): 3710 Type: Standard Thread Diameter: 14mm Thread Pitch: 1.25mm Seat Type: Gasket Center Electrode Material: Nickel Center Electrode Type: Standard Size; 2.5mm Projection: Non-Projected Resistor: No Resistor Value: 1K Ohm Heat Range: 7