Our analgesic demand valve is designed for use with 50/50 N2O/O2 (Nitronox/Entonox®) to meet BS4272-2. It is extremely strong with practical features to avoid cross contamination which provides a good patient experience. There is low patient effort required. Our demand valves are designed to use with generic filter systems. Each demand valve can be supplied with a dedicated pressure regulator (as shown) or with any international hose fitting to use with your own cylinder or wall supply.