Originally Posted by MD3
What is an air gap and how does it work?
My overflows are middle of the coach. Any way to get to them without pulling the entire tank ?-
An air gap in its simplest terms is a physical separation between a water outlet and the "flood level" of a container. If you imagine a kitchen sink and faucet, it is easy to visualize the water coming out of the faucet and falling into the sink. So the "air gap" is that space between the faucet and the sink's high water level. If the water supply was to somehow go into a negative pressure state (vacuum), it can't be drawn back into the faucet because of the "air gap". In a sense, a passive backflow prevention device. The manifold I fabricated and installed inserts that same "gap" between the vent/overflow lines and the water tank.
As far as to where your water tank vents are located I cannot say on the RB floor plan. You have more tanks than I do! On my TS they are very accessible by the simple removal of a panel from the outside compartment. Maybe another RB owner will chime in as to how you can access your vent lines.
In the meantime if you plug the outlets you will temporarily solve the siphoning issue, just be certain you remove the plugs before filling or using the tank!