Engine Heaters and Cords > Tractor Frost Plug Engine Heaters Frost Plug Heater - K962705 Tractor Frost Plug Engine Heaters frost plug heater for David Brown models: 770, 880, 990, and 1200. 600 WATT 1-3/4 inch diameter cup type Includes cord. Price $42.56 $30.53 Quantity Add To Cart Frequently purchased together with this item... Related Items Frost Plug Heater - C7NN8B152B Tractor Frost Plug Engine Heaters Price $57.70 $33.50 Add To Cart Frost Plug Heater - D0NN8B152C-OE Tractor Frost Plug Engine Heaters Price $31.95 $27.75 Add To Cart