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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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Submersible Systems Spare Air Safety Leash 043034

Submersible Systems Spare Air Safety Leash
 
Submersible Systems Spare Air Safety Leash
Customer Reviews
You save $4.05
$11.95
 Mfg Part #:961
Innovative Octo Holder 961 034071

Innovative Octo Holder
 
Innovative Octo Holder
Customer Reviews
$7.95
 Mfg Part #:RB-2200
H2O Extra Air Source Pony Bottle Regulator-2nd Generation 974 033016

H2O Extra Air Source Pony Bottle Regulator-2nd Generation
 
You save $13.70
$269.25
 Mfg Part #:EAS2S
H2O RAS 1 Redundant Air System RAS2S 033124

H2O RAS 1 Redundant Air System
 
$275.95
 Mfg Part #:RAS1
IST Octo RAS1 035170

IST Octo
 
$110.95
 Mfg Part #:O20
Apeks AT20 Octo O20 035095

Apeks AT20 Octo
  Free Standard Shipping
$180.00
 Mfg Part #:AA0025
Apeks ATX40 Octo AA0025 035094

Apeks ATX40 Octo
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$215.00
 Mfg Part #:AA0425
Apeks Flight Octo AA0425 035088

Apeks Flight Octo
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$265.00
 Mfg Part #:AP0385M
Apeks Egress Octo AP0385M 035089

Apeks Egress Octo
  Free Standard Shipping
$185.00
 Mfg Part #:AP0756
Apeks XTX20 Octo AP0756 035093

Apeks XTX20 Octo
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$195.00
 Mfg Part #:AA0340F
Aqua Lung Legend Glacia Octo AA0340F 035096

Aqua Lung Legend Glacia Octo
  Free Standard Shipping
$265.00
 Mfg Part #:129353
Atomic M1 Monel Octo 129353 035041

Atomic M1 Monel Octo
  Free Standard Shipping
$350.00
 Mfg Part #:02-0105-3P
Atomic B2 Octo 02-0105-3P 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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You save $16.05
$239.95
 Mfg Part #:320-8110
Oceanic Alpha 9 MaxFlex Octo 320-8110 035103

Oceanic Alpha 9 MaxFlex Octo
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You save $6.00
$139.95
 Mfg Part #:40.3544.18
Aeris A1 Octo 40.3544.18 035087

Aeris A1 Octo
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You save $10.00
$89.95
 Mfg Part #:30.0200
TUSA Duo-Air 30.0200 035011

TUSA Duo-Air
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TUSA Duo-Air
Customer Reviews
You save $20.05
$199.95
 Mfg Part #:IR-3
Seac Synchro Octo IR-3 035111

Seac Synchro Octo
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You save $15.05
$119.95
 Mfg Part #:8450
H2O Redundant Air System 3 8450 043179

H2O Redundant Air System 3
 
$439.95
 Mfg Part #:RAS3

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