Hansgrohe Bodyvette Square 28469 1 Série Instructions De Montage / Mode D'emploi / Garantie page 6

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English
Roughing In
For each bodyspray, install a properly anchored
drop-ear ell at least 2" behnd the surface of the
finished wall.
Install a test nipple in each ell.
When the finished wall is complete, mark the test
nipple at the wall surface.
Remove the test nipple, and measure it to the mark.
Subtract ⅜" from this measurement. This is the length
of the nipple required.
Use a brass nipple.