Bell Traps

[pedarrin]

I am trying to remember why bell traps are prohibited by the International Plumbing Code, but cannot find any information about them.

Please let me know what is out there about them.

 

[mgw64]

The IPC prohibits bell traps becahse in the way they are designed, they tend to clog with debirs and their trap seal has a larger exposed surface area which accelerates evaporation. This is the way it is explained in the 1997 IPC commentary.