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2. Uniform Plumbing Code - Wikipedia

   en.wikipedia.org/wiki/Uniform_Plumbing_Code

   Designated as an American National Standard, the Uniform Plumbing Code (UPC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation and inspection of plumbing systems as a means of promoting the public's health, safety and welfare.

3. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

4. Plumbing - Wikipedia

   en.wikipedia.org/wiki/Plumbing

   Copper tubing is available in four wall thicknesses: type DWV (thinnest wall; only allowed as drain pipe per UPC), type 'M' (thin; typically only allowed as drain pipe by IPC code), type 'L' (thicker, standard duty for water lines and water service), and type 'K' (thickest, typically used underground between the main and the meter).

5. Weep (architecture) - Wikipedia

   en.wikipedia.org/wiki/Weep_(architecture)

   Another type of weep is a tube that can be made formed by using hollow plastic or metal. The spacing between the tubes is about 16 inches (41 cm) apart. The installation of the tubes are done at angle to allow water to drip out. If the angle is too steep, the opening hole inside the wall cavity will be too high for water to come out.

6. Plumbing & Drainage Institute - Wikipedia

   en.wikipedia.org/wiki/Plumbing_&_Drainage_Institute

   The Plumbing & Drainage Institute (PDI) is an association of American manufacturers of engineered plumbing drainage specialty products.Such products include floor drains, roof drains, sanitary floor drains, cleanouts, water hammer arresters, swimming pool drains, backwater valves, grease interceptors, fixture supports, and other drainage specialties. [1]

7. Plug (sanitation) - Wikipedia

   en.wikipedia.org/wiki/Plug_(sanitation)

   A plug in sanitation is an object that is used to close a drainage outlet firmly. The insertion of a plug into a drainage outlet allows the container to be filled with water or other fluids. In contrast to screw on caps, plugs are pushed into the hole and are not put over the hole.