4rain FLAT S Notice D'installation Et D'entretien page 52

Assembling the tank dome on the tank
1.
Fit the foam rubber seal to the tank opening.
 The seal must sit evenly in the tank open-
ing's groove.
2. Place the tank dome loosely on the tank
opening.
 The tank dome is kept in position by the
filler used for the pit and need not be se-
cured in place.
3. Lay the surround around the tank dome in the
form of successive layers of round gravel
(max grain size 8/16 mm) until just under the
shaft ring.
Mounting the shaft cover
1. Hold the shaft cover with its ribbed side point-
ing up, place it with the pin in the cutout on
the shaft ring segment 3, and insert it in the
shaft ring.
2. Secure the shaft ring using 1 × M6 bolt and
1 × M6 washer in the plate nut. Tighten the
bolt to such an extent that it cannot be re-
leased without tools.
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6 Installing the tank dome and cover
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