As posted already the tiny amount of water left inside will have plenty of room to expand.
If you do chose to leave the anode out fill the hole with a towel or something to keep the spiders and such out of the tank.
I would also suggest you pick up a thread chaser to keep rust cleaned out of the tanks threads.
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2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
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