Oxygen Tank Holder - Heavy Duty. Oxygen tank holder for exclusive use with Drive's Nitro rollator. Accomodates the most commonly used tank sizes (ML6/A tanks M4/A tanks M9/C tanks M6/B tanks M15/D tanks). Conveniently attaches to the Nitro's front end without affecting any of the Nitro's functionality. Dimensions: 24 (W) x 7.5 (L) x 11 (H) Product Weight: 1.7 lbs.