I have for sale a interesting old tank! I believe it was used for fuel but I suppose it could act as a coolant reservoir as well. Has a “hollow” hole through the side of the tank as you can see in the pictures. Not sure what its purpose was other than its unique! Seems to be a good solid tank with no visible pin holes. I believe it’d be a good idea to have the tank rinsed out and re sealed with a tank sealer for best results. Has a old solder repair on the bottom. Please see pictures for the absolute best description.