Might also be Lisunov Li-2, Soviet built version of DC-3 (NATO reporting name Cab, had loading door on the other side of fuselage and different engines) of which over 2000 were built.
Thanks for clearing that up. The length of the pumps and piping is similar to the plane next to it, and it was sleek enough to look airplane-like. However, the North Koreans aren't known for sleek.