lock for the waste water valves.
I have a problem with the kids in my area opening the black and gray water shutoff valves when my trailer is parked outside my house overnight. I usually pick up my trailer the night before we leave, ...
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Since they are not in a compartment you would have to fabricate something. In the mean time consider taking the handles off, they unscrew, and coat the rod with grease. Maybe that will slow them down a bit.
