Shop Nilight 50AMP RV Power Plug Kit Outlet Box Shore Power Inlet Receptacle with Cover Ring Twist Lock ETL Listed 125/250V NEMA SS2-50P SS2-50R Female Plug 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.