FEATURES * Depending on the model, this unit fits the Water Reservoir OR the opening that houses the air compressor filter FITS: Water Reservoir AND HEPA Filter compartment MODEL(S) THIS PART FITS: 1730E, 1730EK, 1730M, 1730MK, 2340E, 2340EA, 2340EK, 2340EKA, 2340M, 2340MK, 2540E, 2540EA, 2540EK, 2540EKA, 2540M, 2540MK, 3870E, 3870EA, 3870EHS, 3870M, EZ10, EZ10k, EZ9, Valueklave (1730 MKV)