NEW Top Quality 400w Heavy Cast Brass Block Heater. (Fits Kubota M, B & L Series tractor engines 3, 4 & 5 cyl w/ 3/4" NPT port in block) Made By the OEM Manufacturer for Kubota This heater installs into an existing 3/4" pipe threaded port on the side of the engine block. We also offer a 1" NPT heater for larger ports. If your machine has such ports, then these units will work for your application. Please check to see if your block has a threaded port before ordering. This little powerhouse heater is a hard to find part ..... and worth every penny in a cold climate. The more powerful heating element and solid brass base casting is just some of what sets this heater apart from the cheap imitators. This heater takes the place of a 3/4" thread pipe plug or you may use it in a 1" threaded hole with a simple adaptor, so if your engine has such a plug or hole into the water-jacket, this unit will fit; if no such threaded port exists on your engine it will not work for your application. Made for us right here in the good 'ol USA, NOT China! Not a flimsy stamped metal part ... solid brass Includes a new heavy gauge 5' power cord for 120V AC and detailed installation instructions. 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 Kubota Tractor engines is in the Right front threaded plug hole. Threads are 3/4" NPT Also replaces old block heaters with LR1843 marking.