Here we have a "Y" or splitter cord for 30 amp connections. Usually used in the RV world but could have other uses. Cord shows zero signs of ever being used. Please study the photos closely as what you see is what you get.
I also have other RV power cord items on Craigslist, if you need a 50 amp 15 foot extension or a 30 amp 25 foot extension use search to find them.