Oxygen Free Dry Nitrogen Cylinder (OFDN) 20L: 250 [Vol, Filling pressure, Test pressure] [20 L, 200 bar, 300 bar] Cylinder valve: W24, 32x1/14"RH (DIN 477, no 10 or equivalent)Cylinder according to requirement of TPED, PED and ADR or DOT equivalent, Concave bottom or convex bottom with footring: 3:Web