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what is the smallest size of type m copper tube available
The smallest m copper tubing available is 1/4.
what is copper tubing used for
Copper tubing is most often used for heating systems, and as a refrigerant line in HVAC systems.
does copper tubing have a weakness
Copper water tubes are susceptible to cold water pitting caused by contamination of the pipe interior, erosion corrosion caused by turbulent flow, and stray current corrosion.

Question: what are the types of the tubing
Self-contained rewrite: what are the types of copper tubing