Hans Grohe Showerpanel Installation Instructions / Warranty page 9

While a helper holds the panel, attach the supply
hoses to the elbows with the compression fittings.
Use two wrenches, as shown in the diagram, to
prevent the supply hoses from twisting.
Tighten the hex head cap screw on the top mounting
bracket.
Install and tighten the hex head cap screw on the
bottom mounting bracket through the hole in the
panel and tighten.
Install the hex head cap screw and large washer on
the center mounting bracket through the hole in the
panel and tighten.
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