Hansgrohe Tango C 042720 Série Instructions De Montage / Mode D'emploi / Garantie page 10

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Three-hole models only:
Lightly lubricate the o-rings on the sealing ring
using white plumbers grease.
Press the sealing ring into the spout tee.
Firmly press the spout over the sealing ring until it
is fully seated.
Tighten the screw using a 3 mm Allen wrench.
3 mm
English
Do not overtighten the screw.
Overtightening the screw will
deform the o-rings, causing a leak.