Rugged construction and precision engineering make this wax injector practically maintenance free. Both hands are free for holding mold while injecting wax. Requires 5-8 lbs. of pressure which can be supplied by a compressor. Made in the USA. Features include 4 quart or 8 lbs of wax, heated nozzle to eliminate wax freezing, nozzle has positive seal and drip guard, accurate thermostat, sensitive air pressure regulator and guage, large wing nuts for easy cover removal and wax loading, on-off pilot light, safety valve for air release-20 lbs., measures 10-1/2" diameter x 21" high. (Picture not shown)Picture is for part number 22.747, 2-3/4 qt. capacity.