Ok I'm having a moment. I'll admit plumbing is not my expertise but I'm still pretty handy and should be able to figure this out.
I have a shower head and tub faucet I want to change out and make more modern.
The current set I have is from an unknown manufacturer, there is nothing stamped anywhere on the old hardware. All I want to do is switch the shower head and tap to something more modern and a decent quality brand (Delta?)
I understand in regards to a shower there is no such thing as universal. Am I correct in assuming that large brass thing behind the hot/cold lever needs to be changed to a Delta (pic attached)
I got a quote from one Plumber and frankly I don't feel that this should be a $1700 job.