The BR7HS SPARK PLUG (86-4122) from Autowares is reliable, durable, and high-quality. This product does not harm the boat engine but only assists in the smooth and safe operations of the boat. These spark plugs from Autowares are designed to operate over a much wider heat range than ordinary plugs. This product resists carbon buildup and pre-ignition. Each spark plug features high alumina ceramics for better heat transfer and electrical insulation. This product has gone through a patented triple gasket sealing process that eliminates the possibility of combustion gas leakage and has a longer insulator nose that prevents fouling and misfiring. Finally, these spark plugs feature solid copper core and nickel-tipped electrodes that provide longer service life. Key Features: Strong, reliable, and high-quality material Constructed for quick and simple use Improves boat engine performance Functional in marine environments High alumina ceramics Solid copper core Nickel tipped electrode Patented triple gasket sealing process Cold-rolled threads to prevent cylinder head damage Product Specifications: Brand: Autowares SKU: 86-4122 UPC: 087295041222 Weight: 0.15 LBS Core Material: Nickel