By Bestbuy.com

Waterdrop - Countertop Water Filter, Replacement for AQ-4035®, AQ 4025, Will Fit AQ4000, AQ4050, AQ4500 Drinking

Replacement model, AQ-4035 and AQ-4025. Will fit the following systems: AQ 4500, AQ 4501, AQ 4000, AQ 4050, AQ 4055, AQ 4601, AQ 4600, AQ 4000W, AQ 4000P, AQ 4000B, AQ 4601.55, AQ 4601.62 and AQ 4601.56. Waterdrop is not affiliated with or sponsored by Aquasana. This product is not an original AQUASANA product.