Shower drain-P trap or 1-way?
Is it common to use a one way type of drain in an RV shower or is it normally a P trap like in a house? We have had no trouble whatsoever with the shower drain but it' been sitting a couple months so I thought I'd pour a cup or 2 of water in each drain today and in the shower it didn't go down till a few minutes went by so I'm wondering if I need to snake it or if this is some kind of one way valve that needs a bit of pressure to open?
edit: I just poured more water in and it went down fine.
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Brian
2011 Winnebago Via 25Q on 2010 Sprinter Chassis
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