| 摘要 |
A length measuring apparatus is used to install a drain in a building. The apparatus includes an inner tube, which has a diameter capable of being inserted into a pipe installation port of a Sextia pipe fitting installed at a lower story of a building, and an outer tube, which has a hollow hole into which the inner tube is inserted so as to slide up and down, and an upper end of which is positioned at the center of a pipe installation hole formed in a wall of an upper story when the inner tube inserted into the hollow hole is in contact with a catch seat of the Sextia pipe fitting. |
