Below we have an Aprilaire humidifier 500 maintenance video made by HVAC.com. Many thanks to HVAC.com for making this informative video! This video shows you step by step how to perform the seasonal maintenance on your Aprilaire 500 Bypass Whole Home Humidifier. In the video it shows how to check the water feed tube, the strainer, the drain tube, the drain spud, the orifice, and the water panel. All of these are important parts that ensure your humidifiers performance and efficiency. Please click here if you would like to see the parts and supplies that we sell for the Aprilaire Model 500 series humidifiers. Please email us anytime if you have questions. Our email address is: firstname.lastname@example.org. We would love to help you out and have your business!