I have seen major issues online with people buying the wrong water filter for their Samsung Fridge/Freezers.
It has caused me no end of stress trying to find out the issue.
Do your online research on this - It's a big problem for Samsung.
The DA29-00003G filter has been produced with TWO different keyways/lugs (!) - 2 lugs AND 3 lugs.
I have a RSH7ZNBP and informed by offical spares (4ourhouse.co.uk / samsungspares.co.uk) mine requires a HAFIN2, but it seems that it should be a HAFIN1 - Wrong information from Samsung!
HAFIN2 now has three lugs rather than two can you believe!
I used a sharp Stanley knife and replicated the old 2 lug from the 3 lug, and now mine fits OK.
I rang Samsung Support, and they confirmed it was a HAFIN1, but wouldn't deal with the issue of all their recommended sites getting it wrong!
Very unimpressed with Samsung!
(...and don't even get on the subject of eco-friendly disposal options of water filters which they also seem to care less about)