Kohler K-402 Guide D'installation page 7

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Framing and Rough Plumbing Installation (cont.)
Determine the desired location for the valve according to the
rough-in information, and construct suitable stud and support
framing.
Use 1/2" nominal copper tubing and fittings throughout this
installation. Smaller diameter piping upstream or downstream of
the valve will reduce performance of the valve.
Kohler Co. 7 1021063-2-C