Highbeam, the flow rate is 4 gpm.
rvtech,to refill the drum,all i do is disconnect the flex hose on the dip tube,undo the strap that holds the drum on the hand truck and load it in my p/u and refill at my co-op.I only have to do this maybe every 9-10 months.I also add a diesel treatment to this drum when i do refill it