This is a brand new water panel filter pad (model 1099-20) for GeneralAire humidifiers. It's the part that sits in the humidifier, absorbs water, and allows evaporation into your home's air. Replacing this filter pad regularly is key to maintaining your humidifier's efficiency and preventing mineral buildup. The brand is GeneralAire. It comes new in its original retail packaging. Includes a California Prop 65 warning label, which is common for many products and indicates potential exposure to chemicals known to the state to cause cancer or reproductive harm – this is a standard legal notice for many manufactured goods. To keep your humidifier running smoothly and your indoor air quality good, swap out the old pad for this fresh one at the start of each season or as recommended. An easy maintenance item that makes a big difference in performance.