Thanks for bringing your question to Tundra Restaurant Supply. This Bunn 03021.0005 Brew Funnel Assembly is a replacement part for the Bunn ITB, TB3Q, TU3Q brewers. In regards to the size of filter you'll need with this funnel, please consult this Bunn filter sizing chart: http://www.bunn.com/pdfs/specsheets/a116.pdf#search="03021.0005". If you have additional questions please feel free to give a member of our team a call at 1-888-388-6372, and we'd be more than happy to talk specifics.
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