I will hazard a guess and say your unit does not have one.
This is not a bad thing as it gives you the options of what you want to use.
My only suggestion at this point is, do NOT install one inside.
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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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