Septa 17.5mm for ND18, Silicone blue/PTFE white, 1,3mm, pk/100 Back Catalog number: 17021417 Availability: In the manufacturer's stock Price on request - + Recommended 702627 Silicon septa PTFE, N12 107,62 € 5190-3158 Septa No-Stick Adv Green 11mm 400/pk 729,90 € 5183-4759 Septa Non-Stick Adv Green 11mm 50pk 103,74 €