Pro Sleeve Boot Guard, Fiberglass Spark Plug Boot Protector, Natural

For decades, Techflex’s Insultherm braided fiberglass sleeving has been the first choice among automotive professionals and enthusiasts alike for many of their thermal protection applications.

These innovative sleeves offers high temperature protection in an easy slip on sleeve that will extend the life of expensive spark plug wires by protecting them where they need it most… at the boot. Just slip these 3/4” (19,1 mm) diameter double thickness (triple thick at the sewn end) sleeves over any spark plug cable and boot (even right angle boots) to protect them from engine temperatures up to 650°C. Once installed, the Insultherm Spark Plug Boot sleeves require no clearance from hot surfaces, and can even rest directly on hot exhaust headers without affecting performance.

Insultherm Spark Plug Boot Sleeves (SPB) are completely non-conductive, resist all engine chemicals, will not support combustion, and provide an easy, economical solution to the challenge of wire protection in the cramped, high temperature environment of any high performance engine compartment.

  • Price per single boot / Price Each
  • Helps protect wires from extreme heat
  • Great for use with headers
  • Made of woven fiberglass and double layered for strength.
  • These spark plug boot insulators are flame resistant to peak temperatures of 1200°F and protect continuously at 500°F.
  • 6" Length
  • Economical, long lasting protection
  • Easy, slip on installation\
  • Protects up to 650°C
  • Halogen free
  • Resists gasoline and engine chemicals

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Pro Sleeve Boot Guard, Fiberglass Spark Plug Boot Protector, Natural

For decades, Techflex’s Insultherm braided fiberglass sleeving has been the first choice among automotive professionals and enthusiasts alike for many of their thermal protection applications.

These innovative sleeves offers high temperature protection in an easy slip on sleeve that will extend the life of expensive spark plug wires by protecting them where they need it most… at the boot. Just slip these 3/4” (19,1 mm) diameter double thickness (triple thick at the sewn end) sleeves over any spark plug cable and boot (even right angle boots) to protect them from engine temperatures up to 650°C. Once installed, the Insultherm Spark Plug Boot sleeves require no clearance from hot surfaces, and can even rest directly on hot exhaust headers without affecting performance.

Insultherm Spark Plug Boot Sleeves (SPB) are completely non-conductive, resist all engine chemicals, will not support combustion, and provide an easy, economical solution to the challenge of wire protection in the cramped, high temperature environment of any high performance engine compartment.

  • Price per single boot / Price Each
  • Helps protect wires from extreme heat
  • Great for use with headers
  • Made of woven fiberglass and double layered for strength.
  • These spark plug boot insulators are flame resistant to peak temperatures of 1200°F and protect continuously at 500°F.
  • 6" Length
  • Economical, long lasting protection
  • Easy, slip on installation\
  • Protects up to 650°C
  • Halogen free
  • Resists gasoline and engine chemicals

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Share your experiences with other customers.


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For years Techflex® has been engineering and manufacturing a wide range of braided sleeving products for a variety of industries from biomedical and aerospace to wire, hose and cable bundling protection solutions. Our experience with this broad market, as well as our wide selection of general purpose and high-tech specialty products, has made Techflex® the first name in braided sleeving solutions.

Hate cables? Are they always in the way? Poorly finished? Want to protect wires, cables or hoses? As an installer , professional or just someone who appreciates a neat finish, you’ll appreciate our Techflex® products.