NGK Spark Plug Stock # 7839

The NGK Spark Plug Stock #7839 (DR7EA) is a resistor-type spark plug engineered for reliable ignition across a broad range of automotive and small engine applications. Built to NGK's exacting manufacturing standards, this 12mm threaded spark plug delivers consistent spark performance in both standard and high-performance operating conditions.

The DR7EA features a 0.749-inch reach and gasket seat design, making it a direct replacement for OEM applications where these specifications are required. The resistor construction suppresses electromagnetic interference, protecting sensitive engine management and electronic components from ignition noise. NGK's proprietary ceramic insulator formulation and fine-wire electrode design promote efficient combustion and longer service intervals compared to standard copper spark plugs. The gasket seat ensures a reliable seal within the spark plug well, preventing gas leakage and maintaining compression integrity.

This spark plug is suited for vehicle owners and technicians seeking verified OEM-specification replacements without guesswork. Whether performing routine maintenance on sedans, light trucks, or small engines, the DR7EA's standardized thread size and reach make it a dependable choice for applications calling out 12mm spark plugs. The resistor design is particularly valuable in vehicles with computer-controlled fuel injection and emission systems, where suppressing ignition-generated RF noise is essential for proper sensor operation.

NGK maintains a strong reputation for manufacturing consistency and thermal range accuracy. Each spark plug is individually tested and gapped to specification before shipping, eliminating the need for pre-installation adjustment on properly matched applications.