What is a shower arm? A shower arm or a shower extension is nothing but a pipe fitting that connects a showerhead to the water supply in the wall. A shower arm extends out of the wall and offers more flexibility to mount a showerhead. With the help of a shower arm, you can raise or lower the height of your showerhead.
Shower arms come in two common designs – standard shower arms, Ceiling shower arms. The shower arm plumbing comes from your ceiling or your wall, you can choose whichever shower head you want and mount your shower head wherever you want.