This is a BRAND NEW in the box AR XMV3G32D pump that will bolt on to a 1" shaft gasoline engine, 3200 psi @ 3.0 gpm. We got a special buy on these pumps from AR and are then able to pass this savings on to you. This is the heavy-duty series where the unloader is separate from the pump head. We strongly advise against buying any pump w/ the unloader as part of the head casting because when it wears out, the pump essentially has to be replaced as the head is almost as much as the entire pump.