Denso GE3-5A Industrial Ultimate Durability Double Iridium Saver-DDI spark plug Specific details of this model include: Thread Size: 14mm x 1.25 Reach: 19mm (3/4") Hex Size: 20.8mm (13/16") Gap: 0.3mm (.012") 100% Pre-Fired: All Denso spark plugs are 100% pre-fired to assure the highest quality possible. Copper-Glass Seal: Bonds the center electrode and insulator together for a gas-tight seal. Maintains proper heat and excludes hot combustion gases. Five-Rib Design: Prevents flashover and decreases voltage loss. Purified Alumina Powder Insulator: Provides exceptional dielectric strength and thermal conductivity allowing the material to stand up to extreme stress. Removable terminal nut. Platinum-alloy tipped fine wire ground electrode, with an Iridium pad on the ground electrode and an Iridium pad without cross grooves on the center electrode. The GE3-5A Industrial Ultimate Durability Double Iridium Saver-DDI spark plug reduces maintenance costs by extending work life in high compression lean burn engines. This unique design guarantees high reliability for withstanding high combustion pressure by incorporating a stress resistant monolithic resistor that adheres to the resistor glass in the high temperature furnace. The Denso GE3-5A Industrial Ultimate Durability Double Iridium Saver-DDI works in the following engine applications: ARIEL: JGS-1 High tension, JGS-1 Low tension ARROWS: VRG220, VRG330 CATERPILLAR: 3306, G333 (3/4"), G343, G3304, G3400 series CUMMINS: No. 173416 5/8" Reach w/N677 Gasket (w/ special adapter), No. 90210035, 90210036 (3/4" Reach) DORMAN: 3DAG, 4DAG, 6DAG, 6QG,D, ATG4,6, 6SEG, 8SEG, 12SEG, 6SETCWG MinNox FORD: 158, 175, 201, 256 cid GENERAL MOTORS: 305, 351, 401, 478, 702 (all gasoline and LPG) INTERNATIONAL: C-537, C-605 JOHN DEERE: 300 series J-W POWER: Superburn Pre-cell LIEBHERR: G924T, G924TC, G926T, H926TC, G926TC40 MAN: E0824E301, E0824E302, E0826E301, E0826E302, E2842, E2842LE, E2843LN, E2876, E2866LUH01 VOLVO TRUCK: GH10C, MG9 WAUKESHA: Natural & LP gas/14mm heads: H1077G, H1077GSI, L1616G, L1616GSI, VRG220, VRG330, VRN265, VRN293, VRN310 VSG series: F11G, F11GSI/CSID, P2154G, P2154GSI, H1077G, H1077GSI, L1616G, L1616GSI WISCONSIN: W2-1230 serial#5996538 & up, W2-1235, W4-2460, W2-1250