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 702604 Silicon septa soft, N 11 77,61 € 702621 High temperature septa N 11 HT 100,38 € 8010-0240 CL Long Life inlet septa 11mm 100pk 228,33 €