Hans Grohe Pharo Skyline 26017XX1 Installation Instructions / Warranty page 8

Tighten the nuts using a 10 mm wrench.
Place a black rubber hose washer in one end
of the handshower hose. Install this end of the
hose on the handshower outlet.
Place the screen washer in the other end of
the hose. Connect this end of the hose to the
handshower.
8
Place the handshower in the holder.
Install the top cover.