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2. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A union also connects two pipes but is quite different from a coupling, as it allows future disconnection of the pipes for maintenance. In contrast to a coupling requiring solvent welding, soldering, or rotation (for threaded couplings), a union allows easy connection and disconnection multiple times if needed. It consists of three parts: a nut ...

3. Banjo fitting - Wikipedia

   en.wikipedia.org/wiki/Banjo_fitting

   Two banjo fittings (upper center of photo) atop automotive brake calipers. The copper crush washer in the gap between the fitting and body of the caliper completes the seal. Compared to pipe fittings that are themselves threaded, banjo fittings have the advantage that they do not have to be rotated relative to the host fitting. This avoids ...

4. Push-to-pull compression fittings - Wikipedia

   en.wikipedia.org/wiki/Push-to-pull_compression...

   A push-in compression coupling and tee.. Push-to-pull, push-to-connect, push-in, push-fit, or instant fittings are a type of easily removed compression fitting or quick connect fitting that allows an air (or water) line to be attached, nominally without the use of tools (a tool is still usually required for cutting tubing to length and removal).

5. Vandal-resistant switch - Wikipedia

   en.wikipedia.org/wiki/Vandal-resistant_switch

   The mechanical types often have gold-plated contacts that do not corrode, to allow reliable low-power switching. [2] A few types are capable of switching 120 or 220 V AC power at several amperes , and are better suited to direct switching of the AC power to a device than the gold-plated contact switches.

6. Corrosion inhibitor - Wikipedia

   en.wikipedia.org/wiki/Corrosion_inhibitor

   The 2014 Flint water crisis was caused by a combination of source water change and a lack of corrosion control. The new, higher-CSMR water not only dissolved lead and iron from the pipes themselves, but also broke up previous layers of lead-containing rusty scale in pipes, allowing them to enter the water supply. [8]

7. Cross-linked polyethylene - Wikipedia

   en.wikipedia.org/wiki/Cross-linked_polyethylene

   A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.

8. Quick connect fitting - Wikipedia

   en.wikipedia.org/wiki/Quick_connect_fitting

   For hoses and piping, a quick connect fitting, also called a push fitting, is a coupling used to provide a fast, make-or-break connection of gas or liquid transfer lines.. Operated by hand, quick connect fittings replace threaded or flanged connections, which require wrench

9. Soldering - Wikipedia

   en.wikipedia.org/wiki/Soldering

   Building codes currently almost universally require the use of lead-free solder for drinking water piping (and also flux must be approved for drinking water applications), though traditional tin-lead solder is still available. Studies have shown that lead-soldered plumbing pipes can result in elevated levels of lead in drinking water. [33] [34]