We have a slow drip from the showerhead itself, not its connection to the pipe. It is the type that has what I think is called a pressure regulator valve, that prevents a change in water temperature when another faucet in the house is turned on while shower is running. I presume it needs a washer at the handle but don't know how to go about getting to it and changing it.

Before we can help we meed the brand name of the valve and it's age. Cheers, Tom

Re. Dripping showerhead, it's a Price Pfister mocel 808-8R8