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Thank you so much. I had no idea what they were.

I just want to know if I need them or not. And what are they? What are they used for?

This is for the showers. We are getting 3 showerheads. A hand shower, a regular showerhead and a rain overhead shower.

I'm in the process of building a home and the builder ask me to pick out showerheads and faucets. I started to see that the showerheads says Transfer valve and/or thermostatic valve and/or volume...