Here are pics of cowboy shower. The plumbing runs through a closet into the stud stall. An RV style shower head is recessed into the wall. The curtain hangs off pvc pipe square suspended from the ceiling. The floor had a 2 inch drilled and plumbed with PVC fittings and then the RV shower pan drain fit into the hole. The water drained to a pipe under trailer and to the side where you can capture in a bucket or keep the cap on and screw a hose into the hose fitting a drain away from the trailer.
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