Turn Riddles

Twist and Turn
Riddle:
I twist and turn and leave a loop you are happy to use. What am I?
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Turn and Turn
Riddle:
I turn once, what is out will not get in. I turn again, what is in will not get out. What am I?
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Cook and Throw Away
Riddle:
I turn around once, what is out will not get in. I turn around again, what is in will not get out. What Am I?
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