A basic central vacuum straight suction hose is designed to fit 99.9% of all central vacuum wall inlets today! The crush-proof basic hose, simply put, is the most basic hose in the central vacuum industry. This type of hose is also known as a straight suction hose. To use, simply insert the wall-end of the hose into the wall inlet. Next, the metal connection on the end of the hose completes the low voltage circuit, telling the central vacuum to turn on. When the hose is removed from the wall inlet, the signal is interrupted then causing the central vacuum to turn off.