Unlimited Oxygen has re-designed the P-20/M-20. It is now the 2010 Tornado and now has a dual compressor configuration.
The 1510 is a modified unit that is similar to what the P-20/M-20 was but does not push the concentrator beyond it's limits.
These newer units have been through better testing and perform as they are designed to.
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Kristian Turley
Old School Glass
(Generations Glass has closed it's doors and is out of business)
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