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 5183-4761-100 Septa Non-Stick Long Life 11mm 100pk 225,04 € 702623 High temperature septa N 13 HT 107,62 € 5190-2209 Gold Plated inlet Seal and Washer, 10/pk 482,89 €