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  1. marchplumber

    Replacing copper air lines in an 809 series

    Handy.........
  2. marchplumber

    Replacing copper air lines in an 809 series

    Rolled copper "soft copper" comes in different wall thicknesses. M is the thinnest. L is standard. K is for water service and H.D. applications. Original piping was probably type L copper. Replacement sounds like M. The O.D. are the same for all...............wall thickness is vastly...
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