NEW Top Quality 400w Heavy Cast Brass Block Heater. Compatible with Perkins 4-203 (without starter obstruction), 4-300 and 4-318 Fits Belarus 500, 800 and 900 Series. Made by an OEM Manufacturer. This heater installs into a 3/4" pipe threaded port on the side of the engine block. The manufacturer also states that it can be adapted to use a 1" NPT port in the same location with the use of a common adapter fitting. If your machine has such ports, then this unit will work for your application. Please check 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. 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. Also replaces old block heaters with LR1843 marking.