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SESK: Stuff Everyone Should Know · sesk.info/epa-process-stub

On a refrigerator or room air conditioner, what is a 'process stub'?

A resealable tube that gives access to the refrigerant.

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  1. A built-in pressure relief plug
  2. A short resealable tube that gives access to the refrigerant ✔
  3. A sticker showing the refrigerant type

Why: A process stub is a length of tubing on a small appliance or room air conditioner. Techs use it to reach the refrigerant, then reseal it when the service is done.

Huh, didn't know that: EPA's definition names both small appliances and room air conditioners as places you will find a process stub.

The dad joke
A refrigerator is a place to store leftovers until they are old enough to throw out.
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References

Answer: A short resealable tube that gives access to the refrigerant. A process stub is a length of tubing on a small appliance or room air conditioner. Techs use it to reach the refrigerant, then reseal it when the service is done.

  1. 40 CFR 82.152 Definitions (Cornell LII) www.law.cornell.edu/cfr/text/40/82.152
    a length of tubing that provides access to the refrigerant inside a small appliance or room air conditioner and that can be resealed
    Checked 2026-10-10.

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