It looks like it has garden hose threads and seems to have a rubber gasket on the male end. The scars on it look like they came from something hitting it more than once, like a mower blade. I'll guess it is from a sprinkler or other water hose related object and got thrown into the parking area by a lawn mower.

Let us know what you find out. Can you ask a gardener to take a look?

 

You guys are just too funny! It's clearly a coaxial part. Here's something similar: http://i00.i.aliimg.com/photo/v1/425...P3_500_pin.jpg

 

gee wiz may have nailed it, if you will excuse the expression.

 

For sure, it's one of your muffler bearings.