Replacement Gasket, Ptfe, 90Mm This all-glass filter holder is used in particulate contamination analysis for filtering aqueous, organic, or corrosive liquids. It is also recommended for HPLC solvent filtration. Complete set includes a borosilicate glass funnel, base and tubulated cap, anodized aluminum spring clamp, and PTFE coated stainless steel screen. Membrane filters are not included. Parts are also available separately.