Thank you for your question. To install the RP78454 diverter tub spout, that comes with the Delta Dawson 144720 model, you will need 2" to 4" of copper pipe from the finished wall. When brazing on the adapter, remove external O-ring first and cool brass down prior to re-installing O-ring. If desired, tubing may be cut off just beyond or flush with end of adapter. The threaded end of the adapter should be facing the finished wall at a distance of 1/4" to 1/2". Please refer to page 7 module 3 b-3 "Copper Sweat installation", in the Installation link below.
Date published: 2017-02-08