When it comes to plumbing things can get confusing, here are some rules of thumb
1) Kitchen and lavatory faucets will usually come with all the rough in material
2) Shower, Tub/Shower and Roman Bath faucets will usually have a separate rough in from the "trim"
Most plumbers will only require the rough in at first so they can close the wall. Once this is complete you will either have your tub/shower installed with walls or you will tile. The "trim" is the last to go on.
Pressure Balance valve's job is to ensure that the volume of water that leaves the pressure balance valve is a constant mix of these two sources, even if the delivery pressure of the two sources changes. This is very important to keep the temperature of your shower constant even when the supply is not.
Most manufacturers will ship the rough in separate (if they are in stock) if requested when trims are on back order
A good faucet will have brass inlay and a ceramic cartridge. They are more expensive than just a metal inlay with plastic cartridge but they will last much longer.
Plastic cartridges over time will wear down from the minerals in the water and start to leak, ceramic will not .
ALWAYS REMEMBER, you can just ask me if you have any concerns or are confused and I will help you : )
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