Anodyne No. 91 Women's Casual Boot Shoes Size:7.5 or the concentrator itself

or the concentrator itself

25 Pack of Brass Washers with Rubber Ring for Oxygen Regulators

while also allowing a more reliable seal

If between sizes

Anodyne No. 91 Women's Casual Boot Shoes Size:7.5 or the concentrator itselfAnodyne No. 91 Women's Casual Boot Shoes With a sophisticated ruched detail and bilateral hook and loop closure, this new number is as functional as it is attractive. The perfect blend of style and versatility. For: Diabetes, Neuropathy, Bunions, Hammertoes, Claw Toes, Plantar Fasciitis, Arthritis, Charcot Deformity, Edema, Swelling, Heel Pain, Heel Spurs. Use: Walking, Working, Active Lifestyle. Features Protective toe box provides extra protection