I removed mine after several instances where it leaked. I pulled the associated plumbing out from behind the shower stall, from underneath too. Now I run the flush line directly thru a manual ball valve on the back of the UDC , to the line attached to the black tank. Never will it leak again. No more wondering of the pressure at the non-potable water spigot is too high or not.
And just so I can access this valve, I installed a small cabinet door in the basement wall. So I can see whats happening at any time behind the basement wall, or gain access to that one way valve whenever I need to. I always like to check the back side of the UDC whenever I hook up to any water source to make sure there aren't any leaks.
After my atmospheric valve blow up, I replaced it with a Sharkbite (brand) brass check valve, as this was locally available at an Ace hardware store (as well as Home Depots). Also, I could not find any brass replacements for the plastic one used. Recent threads on this forum on this subject have had links to a brass atmospheric breaker valve.
BTW, my valve was up in the wall next to my toilet. I had to crawl in my storage compartment crawl space corner, use a drill and jab saw on the subfloor wood above me for 2 hours to enlarge the hole enough to pull out the 3 feet PEX tubing up in the wall with the broken atmospheric breaker valve at the top of this tubing assembly. Then it took less than 5 minutes to put the new Sharkbite fitting in place, and shove the PEX back up in its place.
I have maintained since this incident happened to me in 2011, that this valve should NOT be installed where it is per manufacturers directions (see the 6th line in the "Caution" note at the top of the linked document), and the wording of that 6th line infers that leaking of water is to be expected "under normal operation". This current document has a water pressure maximum of 125 psi, where their previous documentation had no water pressure limits published.
Here is the link:
http://www.bandbmolders.com/files/The_Flusher2_Install_.pdf