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I am a 1st responder and I am using these to secure a D size O2 tank and larger fire extinguisher in my 2018 Jeep Wrangler JL. The installation process was super easy. The velcro snugs up fine on the roll bars and on the tanks. There was no lateral or vertical movement once secured. These units were much less expensive than the steel option I was considering. Overall I am very pleased. Time will tell how durable these are after repeated opening and closing of the velcro straps on the O2 tank.
From a 40 year Firefighter: This is Easy to install on your roll bar with three velcro straps, and three on the fire extinguisher. It holds steady and makes extinguisher access easy and quick. It doesn't come with any instructions, so: Make sure you put the side with the extra short strap on the extinguisher (it supports under it), and the others on the roll bar. Put it on the roll bar first, then strap in the bottle - this leaves some overhang on the bottle straps, making it easier to grab to release them. I put some white duct tape over those tab ends, making them easier to find, see, and pull (see picture).
This is the first time I have ever hoped a fire would start just so I’d have an excuse to actually use it! Until that actually happens I’ll have to settle for telling you all how great this item is. Seems very durable and the velcro actually looks like it it will be clingier than my ex.