The Nitrogen Portable Charging Unit (PCU) or Walk-about Kit is a man portable source of compressed nitrogen gas designed to meet the requirements for portable aircraft gaseous ground support. The compact case is manufactured from rugged aluminium alloy and has a protective coating applied to the colour required. Typical applications include topping-up the pressure in aircraft tyres, gas suspension struts and oleo systems. The unit comes complete with a 3m charging hose, equipped with circumferential quick connectors for ease of use. Each unit comes with a tyre charging adaptor, incorporating a standard Schraeder type valve. A hand-held charging unit may also be supplied, allowing accurate control of the charging pressure at the point of use. The portable walk-about kit is a very useful addition to an operator or maintainer's gaseous ground support equipment and itself may be recharged with nitrogen from a bottle cart/ trolley, air seperation cart or hangar/ workshop supply. Once charged the unit may be deployed where other gaseous ground support equipment is not available. The simple design may be configured to meet a customer's specific requirements (see ordering detail).