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2. 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.

3. powerCon - Wikipedia

   en.wikipedia.org/wiki/PowerCon

   powerCON is an electrical connector manufactured by Neutrik for connecting mains power to equipment in a small space. It looks and works similarly to the Speakon connector, with the line connector inserted in the chassis connector and twisted to make contact and lock. Both line and chassis connectors are fully insulated even when disconnected.

4. Powerlock - Wikipedia

   en.wikipedia.org/wiki/Powerlock

   Line Source connectors (top) mated with Line Drain connectors (bottom). Panel Drain (female) connectors, for feeding power in to a portable distribution cabinet Powerlock is a range of single-pole electrical connectors used for temporary high-current, low-voltage (up to 1000 V AC) applications, [ 2 ] similar to but considered safer than camlock ...

5. Leader head - Wikipedia

   en.wikipedia.org/wiki/Leader_Head

   Copper Leader Head at Penn's Quadrangle, Philadelphia 1894 Copper Leader at Shofuso Japanese House and Garden in Philadelphia. The purpose of a leader head is to help transfer excess water from the roof onto downspouts, thus preventing the gutters from overflowing and water washing over the walls, which is a common occurrence in areas susceptible to heavy rain cycles.

6. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   Flared connectors should not be confused with compression connectors, which are generally not interchangeable. Lacking a compression ring, they use a tapered conical shaped connection instead. A specialized flaring tool is used to enlarge tubing into a 45º tapered bell shape matching the projecting shape of the flare fitting.

7. Twist-on wire connector - Wikipedia

   en.wikipedia.org/wiki/Twist-on_wire_connector

   Twist-on wire connectors are a type of electrical connector used to fasten two or more low-voltage (or extra-low-voltage) electrical conductors. They are widely used in North America and several European countries in residential, commercial and industrial building power wiring, but have been banned in some other jurisdictions.