STANDARD SIZE D/E CYLINDERS (BARB OUTLET) * 0-15 LPM * High strength lightweight aluminum alloy body with all brass core * Green * CGA 870 yoke and CGA 540 nut & nipple * 6 year warranty * Click style and easy to read flow rates * Laser etched: no labels to come off * Protected contents gauge * Ribbed flow selector for better grip * Viton rubber yoke seal with brass ring *