A float valve lets the Sonic Air 23L humidifier run from a reservoir tank instead of being topped up by hand. It sits in the humidifier's tank and closes off the feed when the water comes up to level, so gravity fills the unit and then stops — no overflow across your floor. It connects to a tank by a hose end connector and green garden pipe. If you are using fatter 16mm pipe, you need the larger hose end connector instead. Note: you need two hose-end connectors — one for the tank and another to fit onto this float valve. Setting up an auto-refill humidifier? Here is how the parts fit together Sonic Air Humidifier 23L — 1.44 L/hr with a 23L on-board tank. No float of its own, which is why it needs this valve to run from a reservoir. Sonic Air 23L Float Valve — you are here. The part that lets the 23L top itself up and shut off. Not needed on the Pro. Sonic Air PRO Humidifier — 6.5 L/hr for bigger rooms. Has a float valve built in, so it does not need this one. Gravity Fed Humidifier Refill Kit — the easy route. 50L FlexiTank, 3m hose and connectors in one box, and you can pick the option with this float valve already included. Whichever you run, fill it with RO or distilled water. Ultrasonic humidifiers atomise whatever is in the water, so tap water scales the discs, leaves white dust across the tent, and voids the warranty. Running a float means you are increasing the capacity and reducing the number of times you need to fill the thing up. The tank has to sit higher than the humidifier — gravity is the only thing moving the water, and the float installs at the top of the unit. This valve can also be used as a float valve on the header tank of a DIY hydro system.
