The 92718 kit has a two position on off switch hose which creates a circuit through the two low voltage electrical contacts in your inlet valve. You will see the wall end has a 2 metal contact plates separated by a thin plastic landing. These plates create the circuit through the switch in the hose handle that permits control of your central vacuum. There is a small tab projecting from the top of the hose end that helps you orient the hose in your inlet. This tab should be located at the top of the inlet valve opening as you insert the hose end. The wave combination nozzle is designed to move from carpets to hard floor without the need to make an adjustment. There is a simple friction connection between the floor nozzles and the end of the telescopic wand to make changing tools easier. The wand ratchets at 1 in. intervals from 25 to 42 in. so you can adjust to a height comfortable for your use. Many find the 92718 an ideal second package to complement their electric brush kit for the portion of the home dominated by hard floor surfaces like the kitchen， family room， den， or basement.