Find Fridge filter by Model number. Example your Fridge model number is HFD647WISS -> this Fridge uses Filter model number 836848 which made in 3M CUNO company This filter is also know as Fisher and paykel fridge filters. Part number 836848 is replacement to HFD647WISS HFD647WISS_AB and all Fisher and Paykel fridge model as well.