You'll need the NuTone Central Vacuum E-Box in order to combine an old-style NuTone rough-in kit, such as the CI395RK, with the new Electra-Valve II Wall Inlets (sold separately). The old style plug will need to be cut off at the valve and the E-Box connector will need to be installed in its place to fit with the new wall valve. With their powerful motors, NuTone built-in central vacuum systems pull dust, dirt and allergens from the living environment more effectively than portable vacuums, trapping them within the filtration system of the power unit, away from the living environment. The central vacuum system can also be used more effectively to "power dust" furniture and living space by removing the dust from the living areas rather than just moving it around. And unlike conventional vacuum cleaners, a NuTone central vacuum system is a long-lasting built-in convenience that actually adds value to your home. Manufacturer Part Number: CI399EB. Warranty: 1 Year Limited.