Composite Cylinder Armotech Bmk 6.8-139-300, 6.8 L., 300 Bar, Thread M18X1.5, Stainless Steel Liner-8 Pcs. Ventil For The Cylinder, 300Bar - 8 Pcs. O -Ring For The Valve Of The Cylinder - 1 Unity. (10 Pcs.) Purchase Of Composite Armotech Bmk 6.8-139-300, 6.8 L., 300 Bar, M18X1.5 Thread, Stainless Steel Liner Included (Valve, O-Ring)