Butyl Rubber Tubing Butyl Rubber (IIR) black, without reinforcement, largely impermeable to gas air diffusion approximatley 1/8 that of standard rubber tubing, temperature range up to +100° C Roll Length 25m Catalog No Inner-Ø mm Outer-Ø mm Wall Thickness mm 322 0307 3 7 2 322 0610 6 10 2 322 0614 6 14 4 322 0812 8 12 2 322 1014 10 14 2 322 1216 12 16 2