P trap

[Bjesquivel]

Does anyone put a makeshift P trap in your sewer hose to prevent sewer smells from traveling back up into your tanks/rv?

[atom ant]

Never tried. I guess everything that could come back into the coach already has a p-trap

[Grizzby]

As long as you don't let the p-traps in the coach dry out, no addition traps are required. The toilet doesn't have a p-trap...however, water in the bowl is needed to help keep smells from the black tank from entering the coach (even though there is a seal on the flush valve).

Bob

[Bjesquivel]

I always have my 2 gray tanks open, unless I'm a day or two from dumping my black. I do understand that if all your p traps in the rv have water in them they shouldn't allow any smell that is in your tank to come out. But do you want all those smells that are in the sewer to come up into your tank? My opinion is that the make shift p trap could be a second line of defense against those nasty smells, just incase a trap possibly fails?

[Grizzby]

Unless you are putting some kind of treatment solution in your tanks, they will retain the sewer smell, regardless of an external trap. You can purchase gray tank additives if you feel you need them. Warm weather will exaserbate the sewer fumes.

[travelin' texans]

I usually try to form one with my sewer hose, just leave a droop it, if we are staying long term, requires nothing special.

[piper guy]

Same as Danny, when I put the sewer hose on the Slunky support, I put a section off of it and on the ground. Forms it's own water seal

[hoosierguy]

Originally Posted by Bjesquivel

I always have my 2 gray tanks open, unless I'm a day or two from dumping my black. I do understand that if all your p traps in the rv have water in them they shouldn't allow any smell that is in your tank to come out. But do you want all those smells that are in the sewer to come up into your tank? My opinion is that the make shift p trap could be a second line of defense against those nasty smells, just incase a trap possibly fails?

Just put a additional Valterra gate valve on your main drain line. I use that to allow keeping my grey and galley tank valves open and that allows them to equalize. I then dump all tanks once per week. We don't have a washer/dryer. I always use a tank additive to take care of the odors.

[Dave&Ginny]

I never leave the valves open and I usually don't stay hooked up to the water. I fill the tanks and then dump them for 2 reasons

#1 I'm always ready to leave the park quickly if an emergency situation occurs. This could be weather or 2nd amendment related, I don't want to have to deal with the sewer hose. I can usually be on the road within 15 minutes.

#2 I don't like the idea of the sewer critters having a pathway into my rig.