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 5181-3383-50 Septa , Partial Thru hole Red 11mm 50/PK 74,63 € 5183-4762 Septa Non-Stick Long Life 5mm 50PK 119,80 € 8010-0255 CL Gray inlet septa 11mm 50pk 57,10 €