🔍 Key Concepts

• Purpose of an air receiver in a compressed air system • Safety and maintenance features commonly required on pressure vessels • Function of a drain connection versus a sight glass, thermometer, or manhole

💭 Think About

• Which additional fitting directly prevents internal damage or loss of capacity in normal operation, not just for inspection? • How does moisture behave in a compressed air receiver, and what fitting would you need to manage it regularly? • Among the options, which one is almost always found even on very small, simple air receivers?

✅ Before You Answer

• Identify which item is most essential for routine safe operation, not just periodic inspection • Consider what must be done frequently to remove condensed water from an air receiver • Ask: which fitting would you expect even on a small shop air compressor tank, in addition to a pressure gage and relief valve?