What size filter paper do I need for my funnel? - The Laboratory People
Büchner Funnels, Improved, Glass Frit with Vacuum Takeoff
Filter Funnel
Filter Funnel (Pack of 2) | Stanhope-Seta
Filter Funnel, 3" - Polyethylene Plastic - Resistant to Acids & Alkalis - Great for Laboratory, Classroom or Home Use - Eisco Labs: Amazon.com: Industrial & Scientific