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Old 03-17-2008, 02:38 PM
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Copper Pipe Red or Blue

Can I use either red label or blue label copper pipe for my water line?
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Old 03-17-2008, 04:42 PM
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red or blue label??? All I've seen is type M or type L.
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Old 03-17-2008, 05:08 PM
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Although most people are not aware of the fact, They are correct in referring to copper pipe by color code. If you examine the writing on the pipe you will find that Type K (heavy wall) will have green writing, while Type L (Standard Wall) will have Blue writing and Type M (thinwall) will have Red writing.

Both the International Residential code and Uniform Plumbing code approve all three types for both Supply & Distribution piping.

By definition, "Supply" is the direct buried line from the municipal main or well source to the structure and "Distribution" is the piping within a structure.

Under the UPC type M (thin wall) with Red writing may only be used for distribution piping only if it is above ground. (6" or higher above the slab or basement floor.)

As a rule most plumbers use type L (standard wall with Blue writing) for both supply and distribution piping.
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Old 03-17-2008, 05:43 PM
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red blue

thanks for the advice
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Old 03-18-2008, 07:15 PM
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We, in our plumbing business, have always used "L" labeled with blue printing on all the pipe for all water lines above ground and "M" or red printing just for heat lines from a hot water boiler.
"K" is used for underground pipeing for under slabs.
Gerry
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