GF JRG CleanLine Filter Notice D'utilisation Et D'entretien page 26

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For backwashing only.
Do not use for draining the installation.
Structure
1 Body
2 Primary/secondary pressure gauge
connection
3 Nut
4 Filter cup
5 Filter element
6 Push rod
7 Month ring (gradations 1-12)
8 Hand wheel
9 Drain pipe
10 LED
8