Reinstall Bonnet Nut and Test Functionality

What happens here

With the new cartridge installed, screw the bonnet nut back onto the valve body. Start by hand-tightening, then use Knipex Cobra pliers (or similar adjustable pliers) to snug it up. The video emphasizes, 'Don't go crazy with this,' meaning avoid overtightening, which can damage the cartridge or strip threads. Once the bonnet nut is secure, turn the main water supply back on. Adjust the anti-scald feature on the cartridge (if applicable, by rotating a limit stop) to set the desired maximum hot water temperature. Finally, test the water flow from the shower to ensure it's working correctly and that the persistent drip has stopped.

Goal: Secure the cartridge, restore water pressure, and verify the shower's functionality.