"The E3. 20 lawn and garden spark plug is a 14mm, 0. 750-in. reach plug with a gasket seat designed for 4-cycle, overhead valve engines. Our E3. 20 lawn & garden spark plug features the patented DiamondFIRE ground electrode, which provides greater power, better fuel efficiency, and dramatically lower hydrocarbon emissions. The electrode and full-size center electrode provides optimal performance over an extended product life. Replaces Champion plugs RC12YC and RC14YC, and NGK BCP4ES-11, BKR4E, BKR4E-11, BKR5E, BKR5E-11, BKRES, BKR6EKB-11, FR4, and FR5. Our unique DiamondFire open design forces air gap discharges, creating the preferred edge-to-edge spark path. The design allows replenishment of the spark zone with a fresh fuel/air charge, and exposes the flame front more directly to the piston head than other plug designs. This distinctive spark plug design has proven to simultaneously increase engine power output, reduce gasoline consumption, decrease hydrocarbon and carbon monoxide emissions from the engine, and materially extend the life of the spark plug. Our lawn & garden spark plugs help engines operate more efficiently with a faster and smoother acceleration. Key Features - Power increased > 6% to 12% (depending on engine class) - Fuel efficiency improved > 4% to 13% (depending on engine class) - Emissions reduced in 2 and 4-stroke engines (after 50 hours) - 58% CO emissions reduction, 42% hydrocarbon reduction