Yes, it's all been gone over before.
There is a local place for me in Seattle
called connector world.
I placed a link in an old post.
But they are expensive. Lately I have been soldering
on new wires on the pins with 10-12 crimp wire
connectors and just using an abs plumbing
elbow and sealing it up with silicone and electrical tape.
You can find elbows to thread right on to the motor connector.
Less than 2 bucks compared to about $35-$50.
I still buy the connectors for some motors though,
If you go to their web site and order one I bet you
could waterproof a standard connector yourself just
fine rather than buying their waterproof one. It'll run
you over a hundred bucks.
Mike