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Regardless of which type of alternate air source you select, remember that its performance will depend on the ability of the regulator first stage to deliver air, particularly when it is supplying two second stages and a power inflator. The bottom lines: Given the type of diving you plan to do, how will it work for you in a worst-case scenario? How much risk are you willing to accept? If you dive solo, under demanding conditions or in overhead environments, the greater your need for a completely independent air source and a high-performance regulator as your alternate air source.
(Excerpt used from New Diver Magazine)
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Atomic B2 Octo  033112

Atomic B2 Octo

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$430.00
 Mfg Part #:02-0115-3P
Seac X-5 Pro Octo 02-0115-3P 035109

Seac X-5 Pro Octo

 
$140.00
 Mfg Part #:7001/O
Seac X-10 Pro Octo 750-6206 035108

Seac X-10 Pro Octo

 
$145.00
 Mfg Part #:7004/O
Zeagle Z Octo 7004/O 035116

Zeagle Z Octo

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$239.95
 Mfg Part #:320-8110
Oceanic Alpha 9 MaxFlex Octo 320-8110 035103

Oceanic Alpha 9 MaxFlex Octo

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$139.95
 Mfg Part #:40.3544.18
Aeris A1 Octo 40.3544.18 035087

Aeris A1 Octo

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$89.95
 Mfg Part #:30.0200
TUSA Duo-Air 30.0200 035011

TUSA Duo-Air

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TUSA Duo-Air
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$199.95
 Mfg Part #:IR-3
Seac Synchro Octo IR-3 035111

Seac Synchro Octo

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$119.95
 Mfg Part #:8450
H2O Redundant Air System 3 8450 043179

H2O Redundant Air System 3

 
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Poseidon Jetstream Octo RAS4 035157

Poseidon Jetstream Octo

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 Mfg Part #:0100-006
Submersible Systems Vehicle Mounting Sleeve. 0100-006 042268

Submersible Systems Vehicle Mounting Sleeve.

 
$44.00
 Mfg Part #:973VMPK
Mares Alt Air Control Integrated Octo 973VMPK 035071

Mares Alt Air Control Integrated Octo

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Mares Alt Air Control Integrated Octo
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 Mfg Part #:416893
Poseidon Xstream Octo 416893 035154

Poseidon Xstream Octo

 
Poseidon Xstream Octo
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$339.95
 Mfg Part #:0100-003
Hollis 321 Balanced Octo 0100-003 035062

Hollis 321 Balanced Octo

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Hollis 321 Balanced Octo
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$159.95
 Mfg Part #:240.3624.M
Mares Prestige Octo 240.3624.M 035054

Mares Prestige Octo

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Mares Prestige Octo
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$143.95
 Mfg Part #:416526
Genesis Sidekick Octo 416526 035013

Genesis Sidekick Octo

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Genesis Sidekick Octo
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$106.95
 Mfg Part #:GS065
TUSA Platina II Octo GS065 035058

TUSA Platina II Octo

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TUSA Platina II Octo
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$99.95
 Mfg Part #:SS-20-Y
Aquatec Air 3 SS-20-Y 035250

Aquatec Air 3

 
Aquatec Air 3
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$149.95
 Mfg Part #:AIR 3
XS Scuba Airwave Octo ´´Like New´´ AIR 3 035252-a/032634

XS Scuba Airwave Octo ´´Like New´´

 
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 Mfg Part #:RG320
TUSA Platina Octo RG320 035058-a/032634

TUSA Platina Octo

 
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Genesis S.K.O. Octo SS10 035016

Genesis S.K.O. Octo

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 Mfg Part #:GS060
Genesis Atlas Standard Octo GS060 035155

Genesis Atlas Standard Octo

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 Mfg Part #:GS040

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