Premium DENSO Spark Plug 4509 PTF16TT delivers unmatched ignition efficiency with advanced platinum-tipped electrode technology for extended durability and optimal combustion. Precision-engineered nickel-plated shell resists corrosion while the triple gasket seal ensures leak-proof performance in high-pressure environments. Cross-compatible with BP4FS, BP5FS, BPR4FS series and UR4 models for universal fitment across multiple vehicle applications. Ideal for high-performance engines, fleet vehicles, and extreme temperature conditions where reliable spark delivery is critical. Manufactured to exact OEM specifications with laser-welded components for consistent spark energy output. The tapered cut ground electrode design reduces quenching effect for improved fuel efficiency and lower emissions. Bulk purchase available at wholesale pricing for automotive workshops and distributors.