Step 5 · Install the New Shower Cartridge

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Install the new cartridge. Ensure it's properly aligned and seated in the valve body. Push it firmly until fully inserted. Applying a small amount of plumber's grease to the O-rings will help prevent leaks and ensure a smooth installation.