It should be fine. The anti siphon valve should be at a the "high point" above both ends which are open. It should self drain. I use compressed air and antifreeze when I winterize and I'll blow some air thru the tank rinser but that's just me being overly cautious.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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