Test gas in reusable cylinder ‘Ecomini’ with nitrogen 99.999 vol% (N2). approx. 0.85 litre cylinder size at approx. 37 bar Capacity: 31.5 litres Connection: IG 5/8"-18-UNF valve connection Please return the empty cylinders to Esders GmbH after use. We will recondition and refill them. As a thank you for your contribution to protecting the environment, you will receive a free package of 100 Esders Connect measurements.