Pre-slit White PTFE/Red Silicone Septa, 11mm Crimp-top Aluminum Cap, 5.5mm Centre Hole Back Catalog number: PL30A-016 Availability: In the manufacturer's stock Price on request - + Recommended 918527E-12 Convenience Pack – P/N 31811E-1232 and 5270-11 1 547,00 Kč 5510-11Y 11mm Yellow Poly Crimp™ Seal, 10mil PTFE Lined [Patented] 400,00 Kč 5141-11Y 11mm Gold Seal, Clear PTFE/Butyl Rubber Lined 905,00 Kč