Here is the 1937 oil tank. The feed port is pretty trick, I think a one year only deal. The fitting has a check valve that blocks the flow when you unbolt the line. Simply reconnect your drain line to your drain pan and it flows out. I guess later they decided a drain plug would be easier.
Storage tanks are used for different purposes across the globe but unfortunately, these tanks may prove a massive risk to the environment.
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those banjo fittings are so much more attractive than the later style connectors!
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