The telescopic dome shaft enables infinite adaptation of the tank to the given site surfaces between min. 535 mm and max. 865 mm. The telescopic dome shaft has 7 positions in 50 mm steps (see sketch). To allow the minimum soil covering of the tanks of only 535 mm, the telescopic attachment must be slightly shortened. The sealing ring is placed in the highest remaining complete groove and the telescopic attachment is pushed on (first lubricate the sealing ring). The telescopic attachment must be well supported with back fill material to ensure that it will not sink when under load. For assembling, the telescopic dome shaft is placed loosely on the tank opening. It gains its final stability without further fastening when the pit is filled up and compressed.
