Plumbing. Can a return flow valve on an outside spigot cause a shower pipe to rattle. Only one shower pipe rattles. The rest of the pipes in the house are fine. I have noticed when I turn off the outside spigot the valve doesn't spew anymore releasing pressure.
Thanks
Jim

Water hammer is usually caused by a mixer tap or a solenoid switch, like in a dishwasher or washing machine. I believe that there is a fitting that goes between your water heater outlet and the inlet to your house. It's like a spring loaded non return valve. If you go to your local plumbing store, and tell them you want a valve to stop water hammer,(at least, that's what we call it in Australia) then I'm sure that they will have them. Or ask a plumber. Cheers :)

Thank you. I will check into this.

Buy "Water Hammer Arrestors" and install them in proximity of fixture with solenoid valve.

Yes, back flow attachment on tip of your hose valve can cause your pipes to rattle.