Im trying to lend my motorcycle trailer to somebody here at work.
My trailer has a 7 way socket connection and his car has the 4 way flat connection.
Has anyone ever seen an adapter to marry these connections. I have the adapter in the reverse configuration but having trouble finding it this way.
Is he going to have to get his connection changed?

Head to a trailer parts/camper parts store. They have just about every adapter you can think of.

I needed one a while back and just made one... bought the pigtail with the 4 wire plug, and a 7 wire reciever and wired them together...

That was going to be my suggestion as well Chris. Not hard. Should take all but 10 or 15 minutes max. See ya next Friday.

Yes they exhist, and I bought mine from Auto Zone.

Found it.
Thanks for the feedback.
I went to a trailer supply shop figuring I was going to buy the pieces and splice it together myself. They had complete adapter.
Draw Tite #18321

Autozone had the best selection, we had the same big round connector on the truck and then got the adapter at Autozone which allowed us to hook the flat 4 connect from the trailer.

east coast B i beleive he was trying to do the opposite of what you described. i also made my own adaptor.