Wiktionary
piston rings
n. (plural of piston ring English)
Usage examples of "piston rings".
She didn't understand until Isaac started talking about replacing the fuel injector, the rods, main bearings and piston rings while Alfie found two boxes for their sockets and switches.
Tom set the rod in a vise and carefully wrapped the wire around the piston rings, forcing them deep into their slots, and where the wire was twisted he hammered it flat.
Everything on that engine was bronze except for the bearings (another research group), the cylinder liners, and the piston rings.
I've got a little jobbing house there - in automotive parts - piston rings, gaskets and that sort of stuff.