Copper Pipe Types

Types M and L make up the water supply pipes in homes. Type L has thicker walls and a higher pressure rating. Some local codes specify that only type L is allowed and that type M is not allowed. The international building code allows both L and M, as well as type K for use as water supply pipe.

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Type M Copper Pipe This is the thinnest of the three types of pipes, but also one of the most affordable. Like Type L, it comes in both soft and hard varieties.

Type L copper pipe is recommended where you need strength and protection. But for normal “in the wall” household plumbing, Type M copper pipe is just fine. But for normal “in the wall” household plumbing, Type M copper pipe is just fine.

Copper tubing has three principle grades, from thinnest to thickest are types M, L and K. In addition there are grades DWV for drainage, waste and vent, and type ACR for Air Conditioning and Refrigeration. The references I am using are common in t…

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Copper pipes can be manufactured as soft or rigid copper and offer excellent corrosion-resistance and reliable connections. The three most common types of copper pipe used in residential and commercial construction are Type K, Type L, and Type M. A fourth type, used for drain-waste-vent, or DWV, piping, can be found in some older homes.

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