Portable Oxygen Cylinder a small & portable oxygen device fit for first-aid and healthcare of hypertension Gas cylinder/ Oxygen Cylinder:KBR SeriesThere are KBR-0.7L, KBR-1L, KBR-1.4L, KBR-2L, KBR-4L, KBR-7L, KBR-8L, KBR-10L, KBR-15L and KBR-40L oxygen cylinder for steel and aluminium material with bag or trolley as package, which shall bring great convenience for you and shall be fit for medical ...