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| Plug weld
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Weld which is made through a hole in a piece of metal to fasten the piece to another piece below the hole or for filling in the hole. |
| Plug-in bus duct
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Electrical conductor, which is mounted in a sheet metal enclosure, called a bus, which goes through an industrial building to provide power, with the use of plug in ports along the length of the bus, to lathes and other heavy equipment. |
| Plug-in strip
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Electrical wiring strip, encased in a cover, which has outlets for plugs. |
| Plumb
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Precisely vertical. Also to test for, or to make vertical. Also to perform plumbing work. |
| Plumb bob or plummet
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A lead weight, often pointed at the bottom end, hung at the end of a line and left freely swinging, to determine whether something is perfectly vertical. Since gravity forces the cord to hang in an absolute vertical, the plumb bob is used to align walls and any surface that must be completely straight. |
| Plumb cut
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An absolutely straight up and down vertical cut at the top end of a rafter where it touches the ridge. |
| Plumb line
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String line that holds the lead weight and which hangs freely and swings to allow gravity to force the cord to hang in an absolute vertical. |
| Plumb rule
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Bubble indicator, in the middle of a board, which centers between two vertical lines when the board is plumb. |
| Plumb scratch
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An additional scratch coat that has been applied to obtain a uniform setting bed on a plumb vertical plane. |
| Plumber
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Tradesman who installs and repairs plumbing systems. |
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