That would be an in-wall diverter that shifts the water where you want it.
The Delta RP17454 options to tub, and diverts to shower.
I want to replace our leaky diverter, but would like to know if there is a unit that defaults to shower and diverts to tub. I was going to get a Delta RP17454, but I believe it is as what seems to be common, which is defaults to tub.
Thanks for your reply Terry. So, none of these spout/diverters option to shower by default? I'd like to avoid a semi-remodel (entire tub area is tiled). So an in wall unit really isn't an option for me unfortunately.