The H2O Humidifier Water Chamber is for use with Puritan Bennett's H2O Heated Humidifier. This replacement water chamber is dishwasher safe for trouble-free maintenance.

The H2O Heated Humidifier works with GoodKnight 420 Series CPAP Systems -- including the GoodKnight 420E, GoodKnight 420G, GoodKnight 420S and GoodKnight 420SP -- and GoodKnight 425 Series BiLevel Systems -- including the GoodKnight 425 and the GoodKnight 425 ST.