Identifying waterproof DIN connector
the picture that you posted matches this Conxall Mini-ConX® 6282-2SG-3DC

found here ... https://www.allelectronics.com/item/con-225/2-pin-twist-lock-connector/1.html

this looks like what you are looking for 

http://conxall.com/Category.aspx?Parent=815  ... EN3 product line

Switchcraft EN3P6FX

https://ca.mouser.com/productdetail/switchcraft/en3p6fx?qs=sGAEpiMZZMvG94qpybaIZR9xRg6HOzxYpISh3buVAnc%3D