Best Alumina Insulator

6-Pack NGK Spark Plugs TR55 Stock # 3951

  • Trapezoid cut ground electrode reduces quenching.
  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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Performance Spark Plugs Pair for Softail Deuce 1999-2014 Models

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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Performance Spark Plugs Pair for Softail Deuce 1999-2014 Models

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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Performance Spark Plugs Pair for Softail Deuce 1999-2014 Models

  • Conventional style spark plugs, available in OEM heat ranges.
  • Plugs have a unique look with a black ceramic body.
  • Insulator is made of 95% pure alumina, features strong resistance to heat shock and superior insulation.
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NGK 6431 Standard Spark Plug - BU8H, 10 Pack

  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK 3271 Spark Plug

  • Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties.
  • Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer.
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NGK 5019 Spark Plug

  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK 6578 Spark Plugs (BPR4ES) - Pack of 2

  • Trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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NGK 6737 Spark Plug Pack of 1

  • trivalent metal plating provides superior anti-corrosion and anti-seizing properties.
  • pure alumina silicate ceramic insulator, provides superior strength and better heat transfer.
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