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2. Drain-waste-vent system - Wikipedia

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

   Drain-waste-vent system

3. Air gap (plumbing) - Wikipedia

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

   Air gap (plumbing)

4. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   Backflow prevention device

5. Yes, You Need a Laundry Room Sink—We'll Explain Why - AOL

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6. Drain (plumbing) - Wikipedia

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

   Drain (plumbing)

7. Floor drain - Wikipedia

   en.wikipedia.org/wiki/Floor_drain

   Floor drain - Wikipedia ... Floor drain

8. Sanitary sewer - Wikipedia

   en.wikipedia.org/wiki/Sanitary_sewer

   Sanitary sewer - Wikipedia ... Sanitary sewer

9. Trap primer - Wikipedia

   en.wikipedia.org/wiki/Trap_primer

   A trap primer (or trap seal primer) is a plumbing device or valve that adds water to traps.The water seals in traps are needed to prevent sewer gases from entering buildings, but because this water is exposed to the air, it is subject to evaporation over time in infrequently used floor drains, leading to the release of sewer gas into the environment.