Case 580E Cummins Diesel Block Heater 4-390 4T-390 4TA-390 6-590 6T-590 (4&6cyl) (58mm, Chrome) Compatible with: All (4 & 6 cyl) Cummins 4-390 4T-390 4TA-390 (239ci, 4cyl) & 6-590 6T-590 (360ci, 6cyl) Diesel (turbo & non-turbo) engines in Case tractors and backhoes OEM Manufacturer Reliable cold weather starting Made in the USA