Slow Drain

[AustinBoston]

Actually your right why is a trap necessary. I could see having one when hooking up to a sewage line where you can actually get sewage gases making its way through the plumbing back into the trailer but when connecting to a  couple of gray water tanks does it really mater.

There are a number of reasons:

1) You may someday sell your PUP.  You have no way of knowing how a future user may connect.

2) Some states require a "sealed" gray water collection system.  Since the tank itself will not be vented, even a day or two of use and the gray tank will start to produce sewer gasses.

3) You may someday be camping in a situation where you decide to use an actual sewer connection.

4) Some of the vent-type solutions to slow drains are both cheaper and easier than removing the trap.

Austin (never imagined he would one day live in his pop-up for 5 weeks)

[tlhdoc]

Your dealer may have removed the trap, but Fleetwood certanly did not.
 
Austin

My 1999 doesn't have a trap either.  I doubt that my dealer removed it.  I was the first person to look at the camper and they had to rush to have it ready for my first trip of the year.  If it wasn't ready I wasn't buying it.

[mike4947]

While it may not look like there's a trap in that plastic drain piece that the tubing connect to does indeed have a "trap" built into it. A trap is simply anything that allows water to block air from returning to the sink/fixture. What's in the fitting is simlply a pipe down from the sink strainer that ends up in the small bowl you see from underneath and water can collect in the bowl and cover the opening to the sink.

[mjdfarm]

The PVC vent I built worked.  Much faster drainage.  Thanks for all the suggestions.....