• In this video, This Old House plumbing and heating expert Richard Trethewey explains the various parts commonly used in a home plumbing system.

    1. Copper pipe is available in rigid lengths or in flexible coils.
    2. Type M is thin-wall copper pipe; Type L is thick-wall pipe.
    3. In some areas, Type M pipe isn't allowed for delivering potable water, but it can be used for hot-water heating systems.
    4. Copper pipe is commonly available in diameters ranging from ½ inch to 2 inches.
    5. Lengths of copper pipe are joined together with fittings, which come in many sizes and shapes, including: 90° elbows, 45° elbows, couplings, reducing fittings, and T-fittings.
    6. Fittings can be soldered or threaded onto the pipe ends.
    7. Soft-drawn copper coils are flexible and can make bends without fittings.

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