Product Info Catalog HVAC Humidifiers Chemicals Prefilter for Lasko Natural Cascade Humidifier Prefilter for Lasko Natural Cascade Humidifier Request a Quote UPC: 78757009959 Manufacturer: Rps Products Inc SKU: 127428 Model Number: L8 Carbon Prefilter, Lasko Natural Cascade Fits 1128, 1129, THFf8 Style Humidifiers.