<b>Important Note:</b><br>The plug of 50 amp to 110v RV Adapter Cord is 4 prong NEMA 14-50P, and the socket is NEMA 5-20R, can accept standard 5-15 or 5-20 grounded cords.<br><br><b>Specification:</b><br>Nema 14-50P Male to four Nema 5-20R Female AC Heavy duty power cable, 30AMP, 125V, 3750W.<br><br>Material: STW Cord outdoor jacket+ heavy duty Pure Copper.<br><br>We focus on producing power cord and molding NEMA plug or connector.<br>Most of generally use NEMA plugs and receptacles we can manufacture with PVC cable.<br>We have UL approved for all PVC wire in UL 62 standard, and also have UL approved for most of connectors in UL 817 standard.