One problem we have in our area is small mud dauber bees that like to fill openings with mud. Several times I have had to remove drain valves on the TM and other trailers we've owned and get the mud (and baby bee) out of the valve before it would drain. We had trouble with that also when I worked with trucks. The air tanks wouldn't drain (even with 120PSI air pressure) so we would turn a drill bit - by hand - up the drain valve. (If you use the bit in a drill, it can ruin the valve)
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