NEMA 14-30 Male Plug to 14-30 and 14-50 Female Receptacle. Dryer 4-Prong 30 AMP Y Adapter Cord to Dryer and RV (also for plugin Electrical Vehicle charger). Do not use more than 30 Amp output for dual outlets of this adapter cord, in order to avoid overload. Use on when you have both 14-50 and 14-30 power cord plug, need to plugin a 14-30 dryer 4-prong 30A 240V outlet.