Item #876443

NGK Mercury Spark Plug - 14814568

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NGK Mercury Spark Plug - 14814568

Item # 876443



  • The NGK Spark Plug is the workhorse, at the heart of smooth-running engines around the world
  • OEM Quality
  • Consistent Performance
  • Plug of Choice in Millions of Marine Engines
  • The spark plug insulators are made of 99 percent pure alumina silicate, allowing for longer insulator noses for reduced fouling
  • Triple-Gasket Sealing Process
  • This spark plug features a triple gasket sealing process that eliminates fuel leakage
  • It also includes a solid copper core that provides superior heat dissipation and conductivity
  • This spark plug has resistor that is produced with a glass and carbon mixture, which is fired to ensure superior performance and durability
  • It has corrugated ribs that prevent flash over and cold rolled threads to inhibit damage to the cylinder head


  • Mercury Outboards
    • 9.9 HP 2-Stroke Outboards
    • 15 HP 2-Stroke Outboards


  • Thread diameter: 14 mm
  • Thread reach: 12.7 mm
  • Seat type: Flat
  • Hex size: 21 mm (13/16")
  • Tip configuration: Projected
  • Construction: Special Resistor
  • Terminal type: Solid

Cross Reference for NGK BPZ8HS-15:

  • Autolite 4121
  • Champion QL78YC6
  • Champion L78YC6
  • Denso W24FPRU10
  • Mercruiser 33-939
  • Mercruiser 33-14814568
  • NGK Stock 3180

IMPORTANT: This chart is furnished as a guide only. Certain design differences may exist between this spark plug and another manufacturers and heat ratings can also vary. Always refer to the Manufacturer's application data to select the recommended spark plug for your specific engine

Note: There are more outboard motor applications for this spark plug that are not listed here. See your Owner's Manual to confirm compatibility.

Part Numbers for NGK Mercury Spark Plug - 14814568

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