Reverse "Y" AdapterThe Reverse "Y" Adapter has two male plugs with special power isolation circuitry for added safety. When one plug is connected to a receptacle, the circuitry isolates the second plug. The reverse "Y" provides 50A 125/250V power when only two 30A 125V receptacles are available. Note: Reverse "Y" will NOT work with 50A, 125V, 3-wire inlets. Power is provided in both circuits to the 4-wire inlet, but the dock side receptacles limit the current in each circuit to 30A. The two 30A 125V receptacles must be supplied from a single power source providing from 208V to 250V between them for proper operation. Boat Side: Female Connector 50A 125/250V w/Sealing Collar System Attaches to boat inlet or cordset Dock Side: Male Plug 2-30A 125V Locking Attaches to dockside receptacle or cordset WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov. Quick Guid https://productimageserver.com/literature/quickGuide/49257QG.pdf Brand: MarincoUPC: 093344501357Harmonization Code: 8544.42.90.00Model Number: RY504-2-30Weight: 7.4 Length: 13 Height: 5 Width: 12