Shop Nilight 50AMP RV Plug Power Cord Inlet Cover Ring Twist Lock 125/250V NEMA SS2-50R Locking Female Plug ETL Listed Protector Shore Connector Replacement for RV Camper Caravan Trailer in high quality, support 2 years warranty. Our RV Power Inlet has been tested at an ETL laboratory and found to meet all applicable Standards for Safety published by relevant NRTLs. ETL certification follows the same safety standards as Underwriter Laboratories or UL.