Pinch cock

pinchcock

[pinch-kok]
noun
a clamp for compressing a flexible pipe, as a rubber tube, in order to regulate or stop the flow of a fluid.

Origin:
1870–75; pinch + cock1

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World English Dictionary
pinchcock (ˈpɪntʃˌkɒk)
 
n
a clamp used to compress a flexible tube to control the flow of fluid through it

Collins English Dictionary - Complete & Unabridged 10th Edition
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