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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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Aqua Lung ABS Octo 035100

Aqua Lung ABS Octo
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$145.00
 Mfg Part #:116920
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Submersible Systems 1.7 Cubic Foot Air Xtreme 116920 034667		GET
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Submersible Systems 1.7 Cubic Foot Air Xtreme
 
$274.95
 Mfg Part #:170PKX
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Submersible Systems 1 Cubic Foot Air Xtreme 170PKX 043038		GET
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Submersible Systems 1 Cubic Foot Air Xtreme
 
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$230.99
 Mfg Part #:100PK
Atomic ST1 Octo 100PK 035067

Atomic ST1 Octo
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Atomic ST1 Octo
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$430.00
 Mfg Part #:02-0215-3P
Mares Carbon Octo 02-0215-3P 035074

Mares Carbon Octo
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$398.95
 Mfg Part #:416535
Submersible Systems Spare Air Deluxe Holster 416535 042217

Submersible Systems Spare Air Deluxe Holster
 
Submersible Systems Spare Air Deluxe Holster
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$26.95
 Mfg Part #:971
Aqua Lung Calypso / Titan Octo 971 035099

Aqua Lung Calypso / Titan Octo
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$160.00
 Mfg Part #:128560
Poseidon Cyklon Octo 128560 035158

Poseidon Cyklon Octo
 
$330.00
 Mfg Part #:2981
Oceanic Air XS II 15230 004571

Oceanic Air XS II
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Oceanic Air XS II
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$169.95
 Mfg Part #:08.7020
XS Scuba Altair Octo 08.7020 035251

XS Scuba Altair Octo
 
XS Scuba Altair Octo
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$99.95
 Mfg Part #:RG300YL
Aeris A2 Maxflex Octo RG300YL 035086

Aeris A2 Maxflex Octo
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$129.95
 Mfg Part #:30.0216
TUSA SS60 Octo 30.0216 035104

TUSA SS60 Octo
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$119.99
 Mfg Part #:SS-60
Apeks XTX40 Octo SS-60 035092

Apeks XTX40 Octo
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$235.00
 Mfg Part #:AA0341F
Poseidon Cyklon Metal Octo AA0341F 035159

Poseidon Cyklon Metal Octo
 
$474.95
 Mfg Part #:2981M
Mares Abyss Octo 2981M 035057

Mares Abyss Octo
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Mares Abyss Octo
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$238.95
 Mfg Part #:416504
Aqua Lung Titan LX Octo 416504 035097

Aqua Lung Titan LX Octo
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$215.00
 Mfg Part #:128140
Mares Rover Octo 128140 035079

Mares Rover Octo
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$118.95
 Mfg Part #:416505
Aqua Lung Mikron Octo 416505 035098

Aqua Lung Mikron Octo
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$210.00
 Mfg Part #:127849
Apeks XTX20 Octo 127849 035093

Apeks XTX20 Octo
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$195.00
 Mfg Part #:AA0340F
Zeagle CW Octo AA0340F 035073

Zeagle CW Octo
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$189.95
 Mfg Part #:320-5010
Mares MV Octo 320-5010 035046

Mares MV Octo
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Mares MV Octo
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$69.95
 Mfg Part #:416523
Aeris Air Link 416523 035019

Aeris Air Link
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Aeris Air Link
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$149.95
 Mfg Part #:40.9100
SubGear Aruba Octo 40.9100 035083

SubGear Aruba Octo
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$123.00
 Mfg Part #:811.294.010

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