Common for many RVs is drain fittings leaking, especially the basket gasket from loose LARGE NUT, but HANDS ONLY/ NO TOOLS, as EASY to CRACK PLASTIC fittings, NUTS.... and THEN you need new parts. Sometimes, without proper support, shower/ tub FLOOR can flex/ bend as you move around, helping CAUSE gasket to leak. RV Movement/ sway during travel is no benefit either. The PAN DRAIN FITTING SITS IN PLUMBERS PUTTY, and then (below pan) RUBBER gasket , solid washer (many plastic or paper, to spin nut against?) then NUT. (ONLY seen it ONCE, but had a clear plastic BEVEL WASHER SNAP once on a sink drain fitting after 15+years and start a leak) Sometimes, we do not know why.
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