Originally Posted by 15berkxl
Paul they were standard. I knew the sink had one cause the DW dropped her diamond earring down the drain last year so I went after it. When I was exploring the heat duct under the shower last week low and behold the shower has one as well. Those are the only drains that I see with them on but now reason they all can't IMO.
They are a good idea but with minor problems. They take about the same cubic space as a trap, just a different profile. They on occasion get trapped open and allow gray tank gas to leak back. I use 3oz of straight bleach every three months or so to clear the fouling. Let sit 30 minutes and flush out. Traps are much more costly than the generic u-tubes are. We also have two Hepflo's