Okay, I have read through this thread...still confused over here, lol. I am adding a 3rd concentrator to my set up. I have an Airsep 5 liter unit, a Caire 6 liter unit and an M-15. Do I need back flow vavles in the tubing? I already have them on the two smaller units but do I need to add a 3rd?
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Krissa
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