Agricultural, Industrial & Heavy Duty Applications: Caterpillar 3304 (With oil cooler), 3306 (638 C.I.D.). Replaces 3/4" pipe plug at Rear of oil cooler on Left Side of engine. Detroit Diesel 8.2 Liter (501 C.I.D.). Replaces 3/4" pipe plug on Right front side of engine. Silver Series (6V-92, 8V-92), 12V-71, 16V-71, 12V-92, 16V-92, GMC General (With 92 Series engine) (Alternate installation). Replaces 3/4" pipe plug in oil cooler elbow on right side of engine. Check engine carefully - 3/4" pipe plug not available on all engines. Available Service Parts: Hex Nut (8602999), Element Gasket (8603650). Ford 445 C.I.D. V8 - Navistar T444E Engine (7.3 Liter). Replaces 3/4" NPT threaded plug in oil cooler. Hino W04C, W06E, H06C-T, H07C-B (3.8, 5.7, 6.0, 6.4 & 6.7 Liter). Replaces 3/4" plug in water transfer casting/oil cooler cover International/Navistar T444E (7.3 Liter V8) (Engines manufactured in 1994 & later). Replaces 3/4" threaded plug in oil cooler Mack 865 Series, 866 & 1000 Series, EM9-400 (998 C.I.D.), E9. Installs in oil cooler casting. Two heaters are required. Engine may also accept oil pan heater 8609683, 8609659, 8609713 (requires 1" x 1/2" bushing to reduce port size) Oliver All Models (except 1265, 1365, 1900). Install in cast elbow at front of engine between radiator & engine block