| 摘要 |
The inspection chamber consists of a cylindrical base (2) mounted on a vertical branch from the underground pipe and fitted with a mobile upper section (5) and a cover (11). The base and mobile section are connected by matching threads (3, 7) on their inner and outer surfaces respectively, with locking elements (8, 9) to hold them in the required position. The mobile section has a crown (10) at the top to receive the cover (11) and made with recesses for a key used to rotate it.
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