Below we have an Aprilaire Model 600 maintenance video made by HVAC.com. Many thanks to HVAC.com for making this informative video. Please click here if you would like to see the parts and supplies that we sell for the Aprilaire Model 600 humidifier. Please email us anytime if you have questions. Our email address is: support@arnoldservice.com. We would love to help you out and have your business!