(SOLD) -Twist-to-Lock Marine "Y" Adapter, 50 Amp Plug and Two 30 Amp Connectors
This is a spare Y adapter that I probably will never need, so if someone wants it for $50 plus shipping then it is yours. A 50 amp male plug that twists into a marina receptacle offering 50 amps, and splits that into two 120-volt 30 amp female plugs.
It has been around awhile, and is discolored. But works just fine. When I sold the sailboat I brought this with me, but the new used boat came with one. So I have two.