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Solved! What is this cylinder I found buried in my backyard?
(reddthat.com)
Let us help you identify that mysterious object you’ve found.
Currently in CHALLENGE mode: If you've got something obscure knocking about, post a picture, and let's see how we do. Please prefix such posts with "CHALLENGE:" so we know we've got a fighting chance.
Looks like the same fittings/valves as Primus gas cylinders for camping.
Random link to some camping site for comparison
I think you are correct. !solved
How can you be sure without shooting it first?
it does look like it's name is Mud