Air Receivers
8101018185 - LV521 CE VESSEL 475l 21b
Air receiver is internally and externally hot-dip galvanized.
https://www.atlascopco.com/en-uk/compressors/wiki/compressed-air-articles/what-is-an-air-receiver
https://www.atlascopco.com/en-uk/compressors/wiki/compressed-air-articles/what-is-an-air-receiver