Drill 1-in. holes spaced every 4 in. in the PVC pipe. Use a utility knife to cut slits in the noodle, spacing them 4 in. apart. Line up the pool noodle on the wall so that at least two of the slits sit over studs. Pull those slits apart, slide in a fender washer, and screw the noodle to the wall with 2-in. screws.