Step 3 · Install the Air Switch Button

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Unpack your air switch kit. Take the decorative push-button and unscrew the plastic mounting nut from its threaded body. Ensure the thin rubber or silicone gasket is positioned on the underside of the button's top flange. From above the sink, insert the button's body through the prepared hole. From underneath the sink, slide the friction washer (if included) onto the threaded body, followed by the plastic mounting nut. Hand-tighten the nut until it is snug. The button should be secure and not spin freely. Avoid using a wrench, as this can easily crack the plastic nut.