High quality crushproof hose fits into older style Nutone inlet valves that are just under 1.5 inches in diameter. The inlet is about a 3.5" square. The hose is lighter weight than the bulky style, is durable, and less damaging on baseboards and furniture legs. The accessory end of the hose is smooth (friction fitting) without a button lock nipple. An upgrade to this hose that can fit these Nutone inlets is the Low Voltage hose which has an on/off button for the suction and a comfortable hose handle that also allows the hose to swivel 360-degrees so it rarely kinks. Use with any wands friction fit wands.