The 12147 is the shower head
mounted in a cup with a stainless cover. It has a button to turn the water on and off but it doesn't have a temperature control.
You would control the temperature with the 12134 mixing valve which also functions as a shutoff valve. I think the shower head
in the 121147 is one of those that dribble in the off position so you need a separate shutoff valve, like the 12134.
If you want both the mixing valve and shower head under one stainless cover, you would order the 12141.
Scandvik Marine Inc. - Products
I'll send you a PM with prices. I can get anything from Scandvik pretty much next day as they are here in Florida
. Nice people to deal with.