How to Fix RV Washer P-Trap Dry Out and Stop Gray Tank Odors
After not using my RV's gray tank for days, my bathroom is still getting blasted with sewer smells that seem to appear out of nowhere. My 2025 Bay Star 2826 came pre-plumbed for a washer/dryer in the bedroom closet, but we decided not to install one. The problem is that horrible sewer smell keeps coming up through the washer drain pipe - it's making that whole area of the RV unbearable.
I know there's a P-trap down there that's supposed to hold water and block those gray tank odors, but since we're not using the washer connection, that trap just dries out completely. Every few weeks those awful smells come back with a vengeance. I've tried pouring water down there a couple times, which helps temporarily, but it just evaporates again.
There has to be a better long-term solution than me crawling under there with a pitcher of water every month, right? What do other RVers do when they have an unused washer hookup that keeps letting sewer gases escape? …more
I know there's a P-trap down there that's supposed to hold water and block those gray tank odors, but since we're not using the washer connection, that trap just dries out completely. Every few weeks those awful smells come back with a vengeance. I've tried pouring water down there a couple times, which helps temporarily, but it just evaporates again.
There has to be a better long-term solution than me crawling under there with a pitcher of water every month, right? What do other RVers do when they have an unused washer hookup that keeps letting sewer gases escape? …more