Kohler K-45905 Instructions D'installation page 10

Install the Supply Adapter (cont.)
Ensure that the finished wall material has an upper supply
connection hole diameter between 1" (25 mm) minimum and
1-1/4" (32 mm) maximum, and the hole is centered on the outlet
of the 1/2"-14 NPT elbow fitting.
If your supply connection hole diameter is between 1-1/4" (32
mm) and 2-1/4" (57 mm): Order the 1194302 Large
Escutcheon/Mounting Collar Kit.
Install the finished wall material.
Install the mixing valve trim and bath spout according to the
manufacturer's instructions.
For New Construction and Retrofit Installations
Apply sealant tape to the supply adapter thread.
The supply adapter has an internal 3/8" hex socket. Thread the
supply adapter into the 1/2"-14 NPT elbow using a 3/8" hex
wrench.
1189046-2-A 8 Kohler Co.