Use with Fisher & Paykel Refrigerators, Model Numbers starting with: E442B, RF610A, E522B, RF522A, RF522W, E402B, RF201A, RF402B, RF522B, RF135B, RF170, RS36A, RF170B, RF540A, RS9120, RF605Q, RS90A, RS36A, RS36W, Part number should be on the old Filter you are replacing.,