I asked the same question. Jayo told my dealer that it is not intended to be caulked. Leave it open for water to drain out. Over a year and it has not caused any leaks which was my original concern.
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2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Companion Std hitch
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