This guide provides step-by-step instructions for installing or upgrading a Delta shower faucet in your bathroom. The process generally involves these key steps: 1. **Turn Off the Water Supply:** Locate and turn off the shut-off valves for your shower. Open the faucet handles to release any remaining water pressure. 2. **Remove the Old Faucet Trim:** Carefully remove the old faucet handles and escutcheon plate. A screwdriver, Allen wrench, or putty knife may be needed. 3. **Remove the Old Valve:** Unscrew or extract the old valve cartridge or stems and inspect them for wear. 4. **Install the New Delta Faucet:** Following Delta's instructions, install the new valve and trim, ensuring secure connections and proper sealing. 5. **Test for Leaks and Finalize Installation:** Turn the water back on slowly and check all connections for leaks. Tighten or reseal if needed and reinstall handles and trim.