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2. Air gap (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Air_gap_(plumbing)

   A standard widely use in the United States is: A112.1.2 Air Gaps in Plumbing Systems (For Plumbing Fixtures and Water-Connected Receptors) In the United Kingdom, legislation is by statutory instrument and varies by country, but includes Water Supply (Water Quality) Regulations 2016 and Water Supply (Water Quality) Regulations (Wales).

3. Plumbing fixture - Wikipedia

   en.wikipedia.org/wiki/Plumbing_fixture

   In some occasional cases, a sink may have both a potable (drinkable) and a non-potable water supply. Lavatories and water closets normally connect to the water supply by means of a supply , which is a tube, usually of nominal 3/8 in ( United States ) or 10 or 12 mm diameter ( Europe and Middle East ), which connects the water supply to the ...

4. Uniform Plumbing Code - Wikipedia

   en.wikipedia.org/wiki/Uniform_Plumbing_Code

   All sinks, basins, and water closets need to have separate traps and there has to be trap at the junction with the sewer. [ 9 ] In 1883 Senate Bill No. 132 was introduced by Senator Dougherty into the California legislature which was titled "An Act to grant to Boards of Health in cities and counties the power to regulate plumbing and drainage ...

5. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A trap primer automatically injects water into a trap, maintaining a water seal to keep sewer gas out of buildings. It must be installed in an easily accessible place for adjustment, replacement, and repair. A trap primer, a specialized valve, is usually connected to a clean-water supply in addition to a DWV system. [21]

6. Drain-waste-vent system - Wikipedia

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

   The key to a functional island fixture vent is that the top elbow must be at least as high as the "flood level" (the peak possible drain water level in the sink), allowing it to serve as a de facto vacuum breaker preventing the loop from becoming a siphon for an overfilled sink, as from a clogged drain (rather than vent) line.

7. How homeowners can prevent pipes from freezing during winter

   www.aol.com/weather/homeowners-prevent-pipes...

   Check throughout the home for areas where water supply lines are located in unheated areas of the house. "Take measures to prevent the flow of cold air in these areas," Green Apple Mechanical said.