I think this squeaking sound is actually a good thing, because it makes it harder for you to forget about it if you have the tank drain valve closed. I have heard of people getting distracted while performing this task and then the roof of the motorhome gets "washed"!
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Jeff, Catherine and Turner|2008 Damon Outlaw 3611|W24 w/ 8.1L Chevy hauling in the garage 3 quads,2 dirtbikes,2 CanAm Rykers,1 Rzr900xp, 1 smart42 & 1 sewing machine based in central AZ
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