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What is the small piece of cardboard with Onan f/filter?

Yahoo Message Number: 20508
Went to change my Onan 7.5 diesel fuel filter and noticed a small piece of cardboard about the size of a stamp, inside the cellephane (sp?) that was wrapped around the filter. I bought two new filters and noticed that both had the same thing. Any ideas what this is supposed to be for? Thanks for any thoughts

Larry, 2003 Allure #30856