I had the Hepvo waterless trap in our 2013 375FLF shower. I changed it once due to a damaged Duck Bill. The next time I tried to clean it I wound up with a slip nut that I couldn't get lose and I broke the shower pan drain. I wound up having to replace the shower pan. When I did this, I replaced the Hepvo trap with a standard P-Trap. There was just enough room below the floor to install the trap and clear the black water tank. I'm a plumber so I know the tricks to install the trap and then set the pan.
