I don't know the model number of the one we have, it's electric about a 3/4hp motor, pumps from a 5 gallon bucket. Works well even spray the elastomeric latex roof coating. You got to follow the clean up procedure, leave any thing in the system it will get stuck the next time. We have done a 100' by 50' shed moved the pump two times on each side. Sure beats dragging the buckets up on the roof and rolling it on. Been there and done that. You need a good extension cord, no junk! btw we bought it about 10 years ago.