Because you use the same hose to supply both the power inflator and your alternate air source. Specially designed mesh grid cover to prevent unwanted free-flow even in the strongest currents.
The item "Mares Air Control Alternate Air Source Octopus" is in sale since Wednesday, April 26, 2017. This item is in the category "Sporting Goods\Water Sports\Scuba & Snorkeling\Regulators".The seller is "european_outdoors" and is located in NY. This item can be shipped to United States.