Discover the high-performance BIOGAS ENGINES G3516A+ /G3520 /G3520E/G3520H /G3520C WAUKESHA spark plug, designed for optimal ignition in biogas engines. Featuring a double 'J' gap iridium electrode and resistor type, this spark plug ensures reliable performance and durability. Perfect for various engine models including ERPILLAR, CUMMINS, and more.