The extension - ascending pipe (extension pipe) for the Opti underground filter was manufactured from polyethylene. The extension is made very solidly and guarantees the operation of the system without failure for a long time.
The Opti extension allows for a deeper foundation of the filter in the ground. Extension height: 700 mm. The extension can be shortened to a minimum height of 75 mm.
Overall height: 700 mm,
Can be shortened in 75 mm intervals to a minimum length: 75 mm,
Maximum permissible foundation depth of filter: 500 mm.