Fuel tank 1953 pilot house 1 ton dually flatbed

[Cody pierantoni]

Working on fuel system on 53 1 ton. Looks like there is a drain plug on the bottom of the tank. It looks like a torque plug larger than a 55 torque socket that I have. Does anyone know tool I need for this 

[Merle Coggins]

I believe it's 1/2" double square. A 1/2" drive ratchet should get the job done.