The SmartPlug Combo Kit includes both a 50A 125V/250V inlet connector and a retro-fit connector. This Kit has been designed so it can be used with 3-wires (125V) or 4-wires (250V). The retro-fit connector is designed to use your current cord set. You simply cut off the cord plug on your RV/Boat cord. The connector has mechanical cord restraint, color-coded wire guides, and a water-resistant cord seal. The inlets are available in stainless steel and three non-metallic colors, (White, Black or Gray), of high performance/flame resistant material.

Eliminates Overheating – Increased pin & clip surface area greatly improves electrical conductivity during high amperage demand.
Ease of Use – No twist required, the unique plug body shape and push-in design mean 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 the 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.
Quick & Easy Installation – Inlet mounting flange holes match twist-type holes for an installation that is typically finished in 30 minutes.

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Author's Bio: 

Smart Plug Systems is a privately held manufacturing firm specializing in power delivery systems. It was founded in 2007 and is located in Seattle, WA. Its flagship product, the SmartPlug, is a patented device positioned to replace the current power delivery system for RV’s, Boats, and a variety of specialty vehicles and miscellaneous industrial applications.

Website : https://smartplug.com/