This O2 tank holder is very sturdily constructed and easy to install. The weight of the tank is centered under the rollator seat, so the rollator remains stable while being pushed. The velcro straps that secure the tank are easy to reach and to open and close, and are strong enough to keep the tank from moving in the holder. This O2 tank holder replaces the wire basket that came with the rollator. It would be nice if Dolomite added some sort of under-seat attachment that would clear the O2 tank and allow the user to carry a few small items. P.S. I ordered the tank holder on a Friday and it arrived the following Monday. Excellent service from Wendy's Walkers!