John Deere Tractor Block Heater for: 50 60 70 730 Series A B D & G Engines Compatible with: John Deere Tractor 50 60 70 730 Series A B D & G Engines in a tractor or other farm equipment with 3/4" or 1" NPT port in side of block Solid Brass Construction Easy Installation Made in the USA! New Cord Included