NEMA L14-30 Socket 30 Amp, 125/250V Twist Lock
This is a new 30 AMP, 125/250V, 3 Pole, 4 Wire, Grounding Locking Receptacle of nylon construction. Great for a generator power cord with a 120/240 volt outlet.  I have used similar connectors with 12-4  and 14-4 600 volt rated wire and  10-4, 12-4 and 14-4 300 volt rated wire.Name：L14-30P Plug 2P+N+GProduct Specification：30A 125V/250V～Rating：125V/250V～Electric Current：30AColor：black/whiteDielectric Strength：OVER 100M MINat 500V DC Insulation Resistance：AC 2000V 1MinuteBody Material：PA6 ，H62，PCGrade：94V-0