Should one use teflon tape when putting in shower stems?

It's generally not necessary to use Teflon tape when installing shower stems, as they typically have rubber or neoprene washers that create a watertight seal. However, if the threads of the shower stem are particularly worn or if you're working with metal-to-metal connections, a small amount of Teflon tape can help prevent leaks. Always ensure that tape is applied sparingly and does not interfere with the fitting.