I received a bunch of connectors from China via AliExpress.

I had been looking for such connectors for quite some time. Panel connectors – meaning you mount the female side in the wall of a box and the other side is the male plug and all is waterproof. They are brilliant. 3,4,5,7,9 pole , the 3 pole ones for the tank senders and the one wire temperature senders, the 4 pole for the CAN bus with power and also the RGB strip lights, 5, 7 and 9 for other connections, mainly analog and digital input signals. I am really happy about these, good quality and not expensive.
Below is the 4 pole a bit closer.