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I have been trying to get this to work but it appears to be a victim of library updates. Multiple errors associated with libraries - PubSubClient appears to be a center for these.
3D Printed DNA Lamp
WiFi Controlled LED Wedding Table Pieces
Laser Cutting Class
Just to note so misinformation is not propagated, air and liquid are VERY different in terms of failure mode. As liquid is incompressible, failure of a liquid-filled pressure vessel is very different and relatively benign compared to the failure of an air-filled pressure vessel. Air is compressible and therefore the failure of an air-filled pressure vessel looks a lot like an explosion. I have not studied the properties of PVC but would encourage anyone trying to build a pressure vessel from this material to consider safety first and not to disrespect air as a source of energy.