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<p>[QUOTE=&quot;James Conrad, post: 4403862, member: 5066&quot;]No, it doesn&#039;t.</p><p>Doubts anyone on this forum even knows what the term &quot;modern plumbing&quot; means.</p><p>I&#039;ll try to explain in layman&#039;s terms, it means when we finally figured out how to vent a drainage system to keep fixture traps full of water.</p><p>All plumbing fixtures have &quot;P traps&quot;, the purpose of which is to have a water seal to prevent sewer gas from escaping into a building.</p><p>On the inlet side of the trap you have gravity pushing down on this water seal (approx 14 PSI).</p><p>On the outlet side of the trap, you must maintain this same PSI or you will lose the trap seal with very unpleasant consequences.</p><p>This is where the &quot;vent&quot; comes into play, it maintains the same pressure (gravity) on the outlet side of the trap thereby ensuring the water in the trap stays there.</p><p>It only took plumbers 2000 years to figure this out but HEY! we got there eventually!<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie49" alt=":happy:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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