thanks so much for all the input!
I kept forgetting to look at this thread...I just know I've seen this done, and can't remember where.
I'll do some research on the brand of concentrator and see if I can find out if they have a back flow prevention device sufficient for this idea. If I can't find out with complete certainty, I'll get one.
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I've got way cool handmade bags for sale in the Garage Sale area for a buck each!
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