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Copper Tubing was introduced in about 1900, but didn't become popular untilapproximately 1950, depending on local building code adoption. Common wall-thicknesses of copper tubing are "Type K", "Type L" and "Type M"; Type "M" is relatively inexpensive (until recently. Since 2002 copper prices have risen exponentially due to rising global demand and a stagnant supply.) and relatively thin-walled and generally suitable for condensate and other drains, but generally illegal for pressure applications, Type "L" has a thicker pipe wall section, and is used in residential and commercial water supply and pressure applications, Type "K" has the thickest wall section of the three types of pressure rated tubing and is commonly used for deep underground burial such as under sidewalks and streets, with a suitable corrosion protection coating or continuous polyethylene sleeve as required by code. Types "K" and "L" are generally available in both hard drawn "sticks" and in rolls of soft annealed tubing, Type "M" is usually only available in hard drawn "sticks".
In the plumbing trade the size of copper tubing is measured by its
nominal diameter (average inside diameter). Some trades, heating
and cooling technicians for instance, use the outside diameter
(OD) to designate copper tube sizes. The OD of copper tube is
always 1/8th inch larger than its nominal size. Therefore, 1"
nominal copper tube and 1-1/8th" inch ACR tube are exactly the
same tube with different size designations. The wall thickness of
the tube, as mentioned above, never affects the sizing of the
tube. Type K 1/2" nominal tube, is the same size as Type L 1/2"
nominal tube (5/8" ACR)
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