Universal ProBilt 20 Hot Glue Unit. Part number D100-644, sn: 18102050692P96, 208-240 VAC 50/60 Hz, hose capacity 1 to 4 hoses, tank capacity 20 lbs, melt rate 22 lbs/hr, pump rate 75 lbs/hr at 3200 centipoise, operating temp range 100-425 F. The ProBilt 20 is equivalent to the Nordson ProBlue 10 and Nordson 3500. Unit wt 75#.