Universal Particle Filter Oxygen Concentrator Replacement Filter for 3L Oxygen Generator gray

Universal Particle Filter Oxygen Concentrator Replacement Filter for 3L Oxygen Generator gray.Feature: 1. Layer upon layer purification filtration, can filter fine particles and odor, practical for use. 2. Adopts high density fireproof fiber filter paper, not flammable, no pungent odor. 3. An important accessory for oxygen generator, effectively extend the service life of the machine. 4. Made of quality ABS material, safe and eco friendly, stable and durable. 5. Light weight and in small size, e