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We have been using Fleetguard oil filters, a Cummins product. In the past they have been Racor reboxed, just got three more and thought the boxes looked a bit differant this time around. Opened them up and we have a filter with the felt seal and a bunch of numbers and a plastic "CORE ADAPTER" with an instruction sheet. At the bottom of the sheet it says; "Need help? See www.coreadapter.com