ALTERNATE is to lay down and LOOK at bottom of trailer for the x3 pieces of 1/2" PEX tubing sticking down from the drains? (Some brands) trailers use CAPS without valves, but pretty sure GS uses valves, even on trailers?
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THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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