FC116022002 is the top end head assembly used on the RolAir MK246 air compressor pump. This pump may be labeled on your air compressor as PMP11MK246FC.
The MK246/PMP11MK246FC was commonly used on the FC2002 "The Bull" compressor and the FC2002HBP6 RolAir compressor.
FC2002HBP6
FC2002