Two Rings

Author: Anonymous
10 years ago

Riddle: I have two rings. I move by request. If the mixture is not right, I just sit at rest. What am I?
Answer: I am a Piston. Source: https://riddles.com/index.php/704
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I have two rings. I move by request. If the mixture is not right, I just sit at rest.
What am I?
Two rings by Anonymous Riddle