That’s for sure what it is. They’ve been that way since 2013. The gasket keeps water out when the cap is down but if the cap is up and it rains, some rain can come inside and some will run out that little slot. Especially if the trailer is tilted a degree or two that direction. If you use the shower and you want the best possible drainage, put your little torpedo level on the shower floor and make the drain corner the “low point”.
YMMV
Iowa Dave
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Ain’t no trouble jacking a double Burma Shave
Dave
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