I think they mean you should stick to around the same PSI so the machines dont "fight" each other and create backflow. I still think this is bogus, too. There are check valves in line in these concentrators to prevent backflow. For example, I take one of my 9PSI concentrators and a 5 PSI concentrator (both are 5 Liter Per Minute, or LPM), and a couple test meters I have here in the shop. The meters read 9PSI, and 10 LPM. Since when you have two concentrators together, the flow (LPM) increases but the pressure doesnt.
With my two 5LPM test machines connected, it reads 10LPM. And since one machine is 9PSI and the other is 5PSI, the pressure gauge reads 9.
Both concentrators continue to operate as they should, without them shutting down due to backpressure/backflow. Maybe if your y connector was made out of tiney tubing that would be a problem....
Hope that makes sense.
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