Replacing a shower washer is one of the simplest and quickest plumbing repairs you can undertake and it is usually the source of many leaks one finds in regards to showerheads. While performing the repair, you’re also able to clean and maintain basic parts of the shower and de-scale the showerhead to ensure that you won’t have to fix or replace the washer again for a while.
To begin, turn off the water to the area where you will be working. This may involve turning off the water at the main supply. Let the shower run until no more water comes through and turn it off, and then remove the showerhead, either by using a wrench to loosen it from the shower pipe or screwing it off. You can use the same wrench to loosen the nut from the faucet and then remove the tube. When you loosen the showerhead and remove it from the hose, you might find a build-up of lime or scale, which can be cleaned easily enough in the process.
If you want to be diligent and keep these situations from happening again, you should clean the showerhead and washers once a year. To do this, fill a large bowl with vinegar and submerge the showerhead in the vinegar for an hour. When it’s done soaking, empty the bowl and clean the showerhead with water. Once it’s free of lime, you should be able to take apart the showerhead easily. First, however, take out the old shower washer to a hardware store to find an exact replacement. Upon returning, take apart the showerhead and secure the replacement before screwing the showerhead back together. You can use Teflon tape on the shower-arm thread to ensure no leaks. When screwing the showerhead back onto the arm, be careful not to screw it on too tightly, as this can lead to further showerhead issues.
For a hand-held shower, you should replace both washers. Its not particularly necessary, but it is better to be cautious. In this case, use the Teflon tape on the threads of the hose where the showerhead screws on, and also on the threads of the faucet where the hose attaches. In either case, when you’re finished, turn the water back on and run the shower for a minute or two and then turn it off to ensure the leak has been fixed. If there is an issue, tighten the connections a little more but otherwise, you should be able to use your shower without any subsequent drips.