A couple of suggestions in the comments thread at the site.

A motorbike seems to get the majority vote

That’s one of those whatchamacallits. They are easy to spot. Do you see
on the one end it has a thingamabob that easily attaches to a dohickey.
Also, the clincher for me is that the whole thing is wrapped in one of
those gismo’s

I second what youknowwho said

I think you're both right. I thought at first it was a watchamacallit on circle thingies for sure and the other one a big bottle wrapped in duct tape so I'm probably definitely wrong.

I told dad he didn't need that whole can of lighter fluid to light his new gas grill.

Under the article is says:

Update: We seem to have a winner. It looks very much like a fuel tank, called a composite overwrap pressure vessel. Robin Titus in the comments was the first to specify, for the record. He wins nothing.

@ My hat, Alan, you're a mine of interesting images. Thanks sweetie.

That's my grandfathers tempest levitation valve!

Was Stephen King seen poking around it and is he growing grass out of his skin yet?

Pop and another pop for alan's grill.

hahaha, a motorbike would have been my guess to, its quite obvious its standing right next to the watchamacallit or was that a thingymajig, OH i forget these common household objects names