| 摘要 |
The device has a double grooved open cage for receiving sliding flanges and side drain reliefs in the form of hand clipper for rotatively receiving an external sectional drain. A T-shaped groove receives a brush joint. A tubular cylindrical spacer (15) comprises a shoulder (16) and an inclined plane or rabbet (17) arranged opposite to the shoulder for contacting a sectional flange (14). The sectional flange includes two lower ribs, self-chock guide, and trapezoidal sectioned disks positioned on a tubular support. |
