4rain FLAT Series, Installation/Assembly And Maintenance Instructions, Page: 21 / 44

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5. Installation and Assembly
5.4 Laying the connecting pipelines
All supply lines and overflow lines must have a gra-
dient of at least 1 % in the flow direction (possible
down-line settling must be considered). If the tank
overflow is connected to a public canal this must be
secured against backpressure in accordance with
DIN 1986 by means of a pump station (combined
sewer) or a backflow stopper (pure rainwater canal).
All intake, pressure and control lines must be led
through an empty conduit installed with a slope to-
wards the tank, without sagging and as well as pos-
sible along a straight line. Pipe elbows required must
be with 30° fittings.
Important:
Connect the empty conduit to an open-
ing above the maximum water level.
6. Installing the Shaft Extension and Covering

Cover
 Shaft extension
 Seal

FLAT flat tank
The shaft extension can be shortened at the grooves. This allows earth coverage from 400 to 780 mm
above the tank shoulder.
To mount the shaft extension  set the extension loosely onto the tank opening

and then mount the
seal supplied  . It is not necessary to attach the extension, as the shaft is held in position by the sur-
rounding soil after filling in the installation pit.
Then set on the cover

and close off with child protection. Tighten the screw connections on the
cover firmly enough so that a child cannot open them!