| Description Of Item | The valve clamps directly on to a pin index cylinder of Entonox (premixed nitrous oxide and oxygen – 50% of each). It contains a first stage regulator and a second stage demand (diaphragm) valve, from which a corrugated hose would lead to the inhalation face piece. Used for self-administered analgesia, especially for labour. Reference: Ward’s Anaesthetic Equipment (1st edn., 1975) pp. 152-3. |