Thanks for posting an update on your situation. I agree with poster abjbrtd that the 360 style vent cap was not a great choice for a sat cable rough in (assuming that was factory installed). I would think there would be something better available (cap style; also as noted) with a moulded in cap label on it at least.......but I assume it comes down to cost/profit ratio in the end. Glad you noticed your water in the light fixture and are doing something about it before serious long term water damage can result.
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