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GoodKnight 420 Series
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Covidien Puritan Bennett marketed three models of CPAP and two models of BiPAP in the GoodKnight 420 Series. For CPAP there was the 420G, 420S and 420E. The 420G was the entry level, 420S added data memory and the 420E was the Auto Adjusting CPAP. The Bilevel 425 and the 425ST rounded out the series. The power supply for the 425 was larger and had a larger size connector diameter otherwise all other parts and humidifier components are the same.
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