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Shower Drain wierdness

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oediehl

RVF Newbee
Joined
Apr 4, 2026
Messages
4
A question regarding our 2018 Allegro RED 37ba:

The shower drain wasn't draining well, so I removed the upper perforated cover and tried the baking soda/white vinegar/hot water flush. If anything it got worse. So I thought I'd try the old-school toilet plunger tactic (both dump valves were open through all of this). That didn't help, and it appeared that maybe there's been a bit of reverse suction with the plunger, because I saw something in the drain pipe that I hadn't seen before. I thought maybe it was some obstruction that had somehow gotten into the drain, and so I got some needle nose pliers to try to extract it. It's some kind of rubber sheathing, it appears, and it doesn't want to come all the way out. What am I dealing with here?
1.jpg
 
I'd never heard of a hepvo valve. Fortunately, mine looks reasonably accessible. From watching youtube videos, it looks like mine was installed upside down. Maybe that's why it wasn't draining well
2.jpg
 
Did you have to remove anything supporting the pan underneath to get to that?
 

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