Oxygen Mask 20 Pack – Adult Medium Concentration Bulk pack of 20 adult masks. £99.00 Oxygen Mask 20 Pack - Adult Medium Concentration quantity Add to basket Description Bulk pack of 20 adult, medium concentration masks. You might also like Oxygen Breathing Headset £27.00 Add to basket Oxygen Mask 100 Pack – Adult Medium Concentration £495.00 Add to basket Oxygen Mask 80 Pack – Adult Medium Concentration £396.00 Add to basket