What would be a reason for replacing a working valve for a new rough-in valve in the shower. The new shower head and lever handle I bought says that a new rough-in valve is required. Is it really or are they trying to sell me something I don't need?

Does the new faucet match the old faucet? Same name, same thread patterns?

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Originally Posted by doug238

does the new faucet match the old faucet? same name, same thread patterns?

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The old shower set is a Delta (9 years old) and the new is a Kohler.

The parts are not interchangeable. Replace the valve body.