NGK Spark Plugs, BKR6EKU #6993, 4/pk alt-501182 Slide valve stays on engine

Slide valve stays on engine permanently

5/16" band with engineered perforations

accepts 2 #8 screws

Complies with SAE Standard J553

NGK Spark Plugs, BKR6EKU #6993, 4/pk alt-501182 Slide valve stays on engineStandard spark plugs are chosen by more automotive, motorcycle and marine engine manufacturers than any other. The unique copper core and exclusive electrode design assure fast starts, peak performance and long life. Triple gasket sealing process eliminates gas leakage past the shell 99% Highly pure alumina silicate insulator Solid copper core Corrugated ribs to prevent flash over Cold rolled threads to prevent damage to cylinder head Trivalent