Mine appears to have a trap, I think bikendan may be talking about the black water. Having a trap on gray water, which is not much more than soapy water, when it it siting next to a hole in the floor full toxic waste does sound kind of funny at first.
Thanks for all your responses.
Oh, BTW, I got to find out what happens when the black water gets too high and that didn't end well. It actually happened last night at a campground on Teledo Bend, La. Funny, I was worried about gray water while my toilet was plugged up. ha
Rockwood 2104S, 2014 Ram 2500 Diesel.
USMC 68 -70