543184 Robinair Internal Storage Vessel With Valve. The internal storage vessel (ISV) in this unit is a DOT-approved tank that carries a date code. This type of ISV must be re-certified or replaced every five years. To determine the date code of the ISV in your unit, remove the right side panel. It should be possible to read the date code stamped on the ISV. If the date code reads beyond the five-year limit, replace The Tank (you will need to strip the fittings and valves from the old tank). For the complete tank with all components see RA20089.
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov