A plastic bag and a can of self expanding foam.
Bag will keep the foam from sticking and is cheap enough to cut out and toss in the trash when done.
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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
If you mean a temporary blocking as in winter storage defense against mice infestation, I stuff the holes with brass or copper wool. NOT STEEL WOOL!! Mice won't even attempt to bite through that stuff. It's easy to apply and easy to remove.
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Heartland Big Country 3150RL
2013 Ford SD F250 4x4 SC; 6.2
Reese 18K Elite w/slider - Rockford, Michigan
A roll of aluminum foil is a solid replacement for steel wool where rust or stains would be a issue.
__________________
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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