Use with Aquapak® prefilled nebulizer system to provide heated aerosol - Simple and reliable heater with a nonadjustable heater output -Provides aerosol temperatures between 26.6°C and 32.2°C (80°F to 90°F) -Sold individually. As measured at 7 lpm flow and 60% air entrainment at the end of a 5 ft, 22 mm corrugated hose.