CO2 Tank Bracket 10-15 Lb 6.9 Inch Diameter Matte Black from Power Tank. Made for CO2 10 and 15lb. bottles, Nitrous Oxide, Scuba and Nitrogen bottles that are a standard 6.9- 7 inch diameter.

Are you looking for a better way to strap your Power Tank to your rig? The Super Bracket is super lightweight sub 3 lb, secure, and allows quick release for fast bottle changes. 
Details:

• Matte Black
• 10-15 Lb
• 6.9-7 Inch Diameter
• Locking latch
• Rubber Trim