A hand-held knockout driver for use with a punch and die. The hand-held knockout driver including a housing having a handle portion, a motor positioned within the housing, the motor having a drive shaft defining a first axis, a pump assembly positioned within the housing, the pump assembly having a piston moving along a second axis, a dump valve positioned within the housing, the dump valve defining a third axis, and a working piston moveable with respect to the housing along a fourth axis. Where the second axis, the third axis, and the fourth axis are all not parallel to the first axis.