plug tap

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ground-key faucet

A faucet through which flow is controlled by a slightly tapered plug with a hole in it; when the faucet is on, the fluid flows through the hole; when the plug is turned through 90°, the flow is stopped.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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References in periodicals archive ?
If you want threads almost all the way to the bottom, a bottom tap would be used after a plug tap cut as many threads as it could.
I tend to select a plug tap, depending on the clearance allowance specified on the print.
Longer chamfers (taper and plug taps) help to distribute the cutting force along the length of the tap.
* The chips are forced out ahead of the tap instead of accumulating in the flutes, as they will with a plug tap.
Plug taps cut full threads to within three or four turns of the bottom.