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.