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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.
How close is it to the house? Do you have a gas line in your neighborhood? Could be a natural gas tank for a stove or water heater. I think in some places, trucks go around and fill them. I believe they also have overflow tanks scattered around for underground lines.