Hi Em, i had a look at our 2020 Plus Six and we do not have the wiring connector under the drain outlet.
I suspect this issue could be caused by a different Tech in the cars assembly and positioning of wiring harness ( quality control ) as I found our cars wiring was poorly positioned under the central consul when I changed the auto gear selector.
Looking at the size of the drain bore I think an aeroquip type braided hose and alloy connector would go on the drain stub and look ok, but may be a bit expensive as its a large'ish bore.
When we eventually get home i will have a good root around with a flashlight and see where our cars wiring is positioned, as i suspect the connections are the same, it's just where it's been placed is the issue.
dave


Dave
Plus Six "Squeak"
Roadster departed.
1936 BSA Empire Star Q8. 1935 BSA W7-35. 1938 BSA M20