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 702661 CenterGuide Marathon Septa N 11 97,27 € 5181-3383-100 Septa, Partial Thru hole Red 11mm 100/PK 142,36 € 8010-0241 CL Long Life inlet septa 11.5mm 50pk 121,10 €