I should have paid more attention to the reviews before I ordered this bracket. It's possible your 20lb tank will fit, but mine didn't initially.Holding the bracket up to a straight edge, the mount has an arc to it (see the photo). If the item weren't bent, it might immediately fit a 20lb tank with an 8” rim, but it would be tight.There's a slim chance that if I were to mount this firmly to a flat steel plate, which is my plan, the bracket would straighten enough for the j-hook to catch, but if it doesn't work, I'm left with two holes and no bracket.I may look for a tank with a 10” rim, or I might just return this item. Haven't decided yet, but either way, I'm disappointed.Update as of 5/5/22I was able to squeeze my tank into the bracket. Here's what I had to do:1. Loosen the bolt holding the ring together2. Bend the ring on the foot of the tank slightly where the J hook catches2. Lay the bracket flat on a concrete slab so that it's straightened out by the weight of the tank as I insert it.I've updated to two stars since I was actually able to get the bracket onto the tank. I'm going to try mounting it. If that works (and I suspect it will), I'll update my review again.Update as of 6/2/22Mounting the bracket went smoothly and I'm now happy with it. Some simple, printed instructions with this item would go a long ways. If you mount the bracket securely to a flat surface, it will straighten a bit. Then remove the nut holding the hoop portion of the bracket entirely so that you can catch the J portion of the bracket on the bottom of your tank, then hold the tank securely in place by putting the nut back on and tightening it completely.The good news is that once this bracket is installed with a tank, neither the bracket nor the tank is going anywhere.
Rating: [4 of 5 Stars!]