This is a great belt for users of an Inogen G4 Oxygen Concentrator. The carrying case that comes with the hub has 2 D-rings on the back that attach directly to the 2 tactile hooks that came with the strap. The spare battery fits well in the tactical bag along with the car charger cable and spare cannula. The concentrator with 1 dual battery and 1 spare single battery, car charger, cannula and strap weighs 5.8 lbs. A very strong buckle closure and strap keep the $3,000 hub from falling.
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