- Compatible with pipe 50 mm or 2
- Installed airtight closure tap for vacuum cleaner testing
- Plaster protective cover
- Double bottom with reduced width (only 66 mm)
- Possibility of using it as junction box
- Extended back technical elbow to improve airflow rate
- Reversible up/down opening
Available in two different variations:
Backup box with 90° ell - code SD101
Backup box with straight coupling - SD102
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