This 12 foot low voltage extension hose allows areas to be reached for which the main central vacuum hose is too short. This extension hose is inserted into the vacuum inlet. The other end connects to the main hose. Unlike traditional extension hoses, this one has low voltage wire which allows the switch on the hose to continue to control the power unit. This extension hose fits most central vacuum inlets with 1 1/2" ID except Nutone and Vacuflo.