If you Dive with a Spare Air Redundant Air System (see SKU's: SX27Y or SX27N) this ZEAGLE Holder for a Spare Air System Fits-Conveniently Out-of-the-Way under the Bladder Wing (can mount on either side). The Spare Air Holder is made from an Elastic Nylon Weave, this Pouch Securely-Holds a Spare Air Bottle, allowing it to be Quickly-Zipped-and-Unzipped from the LTD Wing. A Nylon Webbing Strap with a Hook & Loop Closure Secures the Neck of the Bottle for Added-Security. Easy-to-Install on the Wing with Zipper Fastener to the ZEAGLE Zip Universal Mount Adapter (see SKU: ZGL8137). Spare Air Mount is covered by a 12 month limited warranty.