Inside the DC-4 "Oil Bomber"

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Looking forward from the rear cargo bay of the DC-4. The four large tanks can each hold three thousand gallons of liquid, which are pressurized by the two heavy pumps in the foreground.

The oil dispersant is then pumped out to the wing boom couplings by the large black hoses. The narrow walkway provides access to the flight deck.

The ends of the spray booms can be seen on the right side of the photo. They're removed from the wings and stowed inside to help streamline the aircraft on it's ferry flight.