Slips easily onto Buchner funnel stems and seals-off the filter flask mouth to prevent air leaks during vacuum filtration.
• Center hole fits funnel stems up to 22mm (⁹/₁₀") diameter• 9.5mm (³/₈") thick by 76mm (2⁹/₁₀") O.D. ring is wide enough to fit filter flasks up to 4000ml
• Made of chemical-r..