We stock every part for the Vapac LDV4-S Steam humidifier ever made. Our technical support team can assist you should you have any questions about your Vapac LDV4-S Steam humidifier. Order from the source of Vapac Steam humidifier tanks and parts just like the contractors do. You will find on-line owners manuals as well as exploded views of your model on its associated humidifier parts page. Remember to replace your Vapac steam tank at least once per year for optimal operation. Most Vapac steam humidifiers will bring up a warning sign when the steam tank fails. Unfortunately you must view the unit periodically to know when it is time. We recommend you replace the steam tank at least once per year for residential applications and more often for commercial and industrial humidification needs.