They look like CLIFF connectors.
In the UK from here:
http://www.rapidonline.com/Cables-Connectors/Cliff-Electronic-FC684214-PLUG=
-
4-PIN-STRAIGHT-ON-CABLE-6mm-FEMALE-50-3216

Available in 2 to 8 pole.=20


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
James Cameron
Sent: Tuesday, December 1, 2015 3:25 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Identify 4 pin "aviation plug"

Yes, I've seen some variations on this connector, but no idea where to get
it from.  My guess is aviation supplier$.

--
James Cameron
http://quozl.netrek.org/
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