I have two, one is a 1/2 -55 gal barrel with a pump and I add water from time to time thur out the day.
I have the pump hose come out of the top and on to the side with a 3/4 inch pipe to pump the water around.
When I want to pump water out I just pull the hose off and hang over board to drain.
For the truck I have a full 55 gal barrle laying on its side with a cut out for a door. Also same set up with the pumps. for ease of draning
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