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B767 picture with circled feature

Can anyone identify which comms/nav system the circled antenna belongs to?

Thanks.

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    $\begingroup$ I‘d have to double check, but I believe it’s a drain mast rather than an antenna. $\endgroup$ – Cpt Reynolds May 14 '19 at 18:58
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That is one of two heated drain masts for the lavatory sinks.

enter image description here

How does the drainage of the gray water work?

enter image description here

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