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In a message dated 3/18/2004 8:00:23 PM Central Standard Time,
cmpiano@comcast.net writes:
Home Depot has red copper and blue copper but don't know the difference. A
plumbing shop down the street, said that it was the thickness of the copper.
There is green, blue and red. He said that Green is made for air and is
cleaned on the inside (used in hospitals etc.) Also expensive.
Copper tubing that has red lettering is called type "M" copper and is
used for a basic residential and light commercial plumbing both liquid and air.
Type "L" has blue lettering. It is used for heavy duty plumbing and air
lines and has a higher pressure rating. Both come in straight hard 10'-20'
lengths or in soft rolIs up to 100'. You can "sweat" the fitting on, use
compression fittings, or flare fittings.
I don't remember for sure but suspect the green is for refrigeration.
It is internally dried and sealed at the factory. Comes in 50' rolls and
perhaps 100'. My .02 worth.
Charles Cron
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