This water filter removes chemicals and contaminants from your drinking water, resulting in clean tasting and clean smelling water. We recommend a new filter every six months for optimal water drinkability and flow. Use with Fisher & Paykel Refrigerator Models beginning with: E402, E442, RF135, RF170, RF201, RF402, RF522, RF540, RF605, RF610, RF730, RS1884, RS2484, RS3084, RS36, RS4621, RS6121, RS7621, RS90, RS9120 If you have an older refrigerator model you may need to use part no. 862285 or 862288. Please check your filter for the part number before purchasing