This is it... The ultimate, most powerful heater available for the ford 7.3 Diesel..... New top quality 1500w heavy cast steel & nickel chrome plated block heater. (7.3 Diesel engines). This unit will only fit 1995 and newer 7.3 Engines. We have a different heater listed for the 1995 and earlier 6.9 And 7.3 Idi engines. Look at the pictures.. The picture with two heaters shows how much larger the element and housing are than even our 1000w heater. The difference as compared to the factory 600w heater (not shown) is even more striking. Safe for use in all 95+ 7.3 Powerstroke engines, heats engine to a warmer final temperature than the smaller heaters. Warmer starts = better cold starting and less engine wear! This big powerhouse heater is a hard to find part, in fact we are the only place to find this special heater! This is (by far) the most powerful and durable block heater available for the ford 7.3 Diesel. More than twice the performance as compared to the 600w heaters available elsewhere. The longest and most powerful copper heating element available, coupled with solid heavy cast steel / nickel chrome plated base casting are just some of what sets this heater apart from the cheap imitators. Made for us right here in the good 'ol usa, not china! Not a flimsy stamped metal part ... Solid metal, and nickel chrome plated for longevity & anti corrosion. Includes a new heavy gauge 6' power cord for 120v ac and detailed installation instructions. 7.3L ford diesel engines in any vehicle..... Pickup trucks, vans, tow trucks..... powerstroke 7.3 Diesel engines. Replace an old heater... Or install in an engine that never had one. A must for smooth safe engine starting below 30 degrees f. Standard mounting position for the powerstroke 7.3 (Navistar t444e) is in the rear oil cooler end casting, on left side of engine. Heater size is 3/4 npt. Also replaces old 7.3 L block heater with lr1843 marking.