Hansgrohe AXOR Citterio 390341 Serie Instructions De Montage / Mode D'emploi / Garantie page 6

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English
Connect the supply hoses to the hot and cold stops.
Use two wrenches, as shown in the diagram.
9 mm
16 mm
If the flow of water diminishes over time, remove and
clean the aerator.

Do not allow the hoses to twist.