Originally Posted by tr0y
Do you vent as you would residential plumbing for good flow into the tanks ? Or is there some specific way to vent RV plumbing ?
The plumbing principles are the same as they relate to vents in houses and RVs. Manufactures are guided (and regulated) by different building codes than residential contractors to be sure, but the principles of plumbing and electricity remain the same.
The plumbing schematics are widely available for every Airstream, and the same general principle applies in them all.
The drain lines to each holding tank are vented to ensure good flow from the sink,shower, or toilet to the tank by eliminating any vacuum in the lines.