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A couple of knocks after the valve shut off. No knocks when the water is running.

After a master bathroom remodel (new shower tiles and valves), every time the toilet flush or any faucet within 50 feet closes, there's a knocking sound from wall and ceiling with the shower. The piping is CPVC and PEX just at the shower. I tried a small hammer arrestor at the toilet and...

Thank you HJ for the comments.

Terry, thanks for sharing those pictures. If I go with the AAV option, this is what I think it will look like. It's a lot of simpler.

Fair enough. Thanks for the pointers. Now, the design has no more horizontal vents below the flood rim. Instead there is a long trap arm and long waste line with some horizontal turns. I also included a couple of cleanouts. Could this work?

Terry, Thanks for the quick response. It sounds like it has to be either the loop or the AAV or raise the horizontal vent to meet the code requirement. I'll look to redesign. Now as an intellectual exercise, purely from a functional point of view, why is long trap arm (42" for 1 1/2" and 60"...

Instead of the typical loop vent for an island which would require concrete work, I'm opting for a column on the island to run the vent up to the attic to tie-in to a near by vent. Considered the AAV, but decided to avoid that path if possible. Would either of these vent configurations work and...