Results 1 - 30 of 49 29169-U red seal, PTFE/silicone septa, diam. × thickness 20 mm × 3 mm. View Pricing · 29171-U red seal, septa (blue PTFE/white silicone), Vials and caps - Separations. Factory space in Düren: 30,000 m² Crimp caps N 20 with septa silicone / FEP-/aluminium foil ... Inserts for screw neck vials N 8 (small opening). Products in Vials on Thomas Scientific