Camco RV Power Grip Maximizer Adapter gets up to 45 AMPs combined power. It draws the combined power from a 15 and 30 AMP outlet, which allows the RV to receive up to 45 AMPs. This maximizer does not work when plugged into GFI type outlets. It is a polarized adapter designed solely for recreational vehicles and is not for use with any other adapter or device. This maximizer adapter must be used in conjunction with properly sized circuit breakers