| 摘要 |
A pipe alignment device utilizing a light source to project a spot onto the opposite structure for use in spotting the locations of roof openings for plumbing ventilation pipes in new building construction. The device is in the form of a cylindrical housing having several different stepped diameters for insertion into top plate holes of different sizes. The different diameters are sized in accordance with various standard sized pipes and fittings. The light source may be integrated or insertable, and battery-operated or externally powered. One or more levels may also be included in the device to assist in the alignment process.
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