SmartPlug Systems, LLC BF50 50 Amp Connector Assy Ease of Use - No twist required, the unique plug body shape and push-in design means it only goes in the right way every time - even in the dark! Multi-Point Locking System - Side clips lock the plug securely into the inlet which eliminates any stress on the pins from movement of the power cord Weatherproof Seals - Multi-fin silicone gaskets installed in the inlet cover and interior of the plug body eliminates moisture penetration