Shop › 820607 - Membrane, 25 mm, PTFE for Gas Diffusion, 12-pk 820607 - Membrane, 25 mm, PTFE for Gas Diffusion, 12-pk $117.98 FIAlab PN 820607 FIAlab PN 820607 Add To Cart Added! You Might Also Like 79167 - Flow Cell Window Replacement Kit: 2 Teflon seals, 2 o-rings, 2 SMA connectors, 2 jam nuts, 2 silica flow cell windows $177.50 24055 - 4-Way Manual Switching Valve with Diagonal Flow $222.14 82060 - Polypropylene gas diffusion membrane tape kit (12-pk) $175.38 41220 - Pressure Lever Cassette/Cartridge for FIAlyzer-1000 Peristaltic Pump $183.88 71015 - Cadmium Column for Nitrate Reduction (Package of two, second one 25% off) $589.98