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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 SS1 Octo 035069

Atomic SS1 Octo
  Free Standard Shipping
Atomic SS1 Octo
Customer Reviews
$254.00
 Mfg Part #:14-0001-3P
Submersible Systems Spare Air Pack 14-0001-3P 043030

Submersible Systems Spare Air Pack
  Free Standard Shipping
Submersible Systems Spare Air Pack
Customer Reviews
You save $49.05
$249.95
 Mfg Part #:300PKYEL
XS Scuba Airwave Plus Inline Octo 300PKYEL 035035

XS Scuba Airwave Plus Inline Octo
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XS Scuba Airwave Plus Inline Octo
Customer Reviews
You save $20.05
$159.95
 Mfg Part #:RG330
Sherwood Brut Octo RG330 035076

Sherwood Brut Octo
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Sherwood Brut Octo
Customer Reviews
You save $22.05
$124.95
 Mfg Part #:SR9902
Atomic Z2 Octo 21.089.000 035068

Atomic Z2 Octo
  Free Standard Shipping
$290.00
 Mfg Part #:02-0360-3P
ScubaPro R195 Octo 02-0360-3P 033344

ScubaPro R195 Octo
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ScubaPro R195 Octo
Customer Reviews
$209.00
 Mfg Part #:11.331.200
Apeks XTX50 Octo 11.331.200 035091

Apeks XTX50 Octo
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$265.00
 Mfg Part #:AA0342F
Oceanic Slimline 2 Octo AA0342F 035029

Oceanic Slimline 2 Octo
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Oceanic Slimline 2 Octo
Customer Reviews
You save $5.00
$129.95
 Mfg Part #:40.4242.53
Aqua Lung Legend Octo 40.4242.53 033417

Aqua Lung Legend Octo
  Free Standard Shipping
$229.00
 Mfg Part #:129720
Oceanic Alpha 8 Octo 129720 035085

Oceanic Alpha 8 Octo
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You save $20.00
$109.95
 Mfg Part #:40.3540.53
Atomic Ti2 Titanium Octo 40.3540.53 035040

Atomic Ti2 Titanium Octo
  Free Standard Shipping
$350.00
 Mfg Part #:02-0005-3P
Zeagle Octo-Z Breathable Inflator 02-0005-3P 035047

Zeagle Octo-Z Breathable Inflator
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Zeagle Octo-Z Breathable Inflator
Customer Reviews
You save $9.05
$229.95
 Mfg Part #:320-7200bk
XS Scuba Airwave Octo 320-7200bk 035252

XS Scuba Airwave Octo
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XS Scuba Airwave Octo
Customer Reviews
You save $15.05
$109.95
 Mfg Part #:RG320
Zeagle Razor Regulator 40.8003.53 033052

Zeagle Razor Regulator
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Zeagle Razor Regulator
Customer Reviews
You save $3.05
$374.95
 Mfg Part #:350-6240
Aqua Lung Airsource QD Octo HEED-3 035101

Aqua Lung Airsource QD Octo
  Free Standard Shipping
$235.00
 Mfg Part #:15230
Sherwood Gemini Breathable Inflator 15230 035038

Sherwood Gemini Breathable Inflator
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Sherwood Gemini Breathable Inflator
Customer Reviews
You save $10.05
$199.95
 Mfg Part #:SR9000
XS Scuba XTR Extra Air System SR9000 043255

XS Scuba XTR Extra Air System
 
$480.00
 Mfg Part #:XTR
Scuba Breakaway Octo Holder XTR 032634

Scuba Breakaway Octo Holder
  Free Standard Shipping

on orders over $25
Scuba Breakaway Octo Holder
Customer Reviews
You save $2.00
$7.95
 Mfg Part #:CLIP-1E
Zeagle Envoy Octo. CLIP-1E 035268

Zeagle Envoy Octo.
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Zeagle Envoy Octo.
Customer Reviews
You save $22.05
$139.95
 Mfg Part #:320-3110U
Zeagle 20 cubic foot Redundant Air System 320-3110U 043133

Zeagle 20 cubic foot Redundant Air System
 
$542.00
 Mfg Part #:750-6220
Aqua Lung ABS Octo 750-6220 035100

Aqua Lung ABS Octo
  Free Standard Shipping
$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
BUY THIS...
Submersible Systems 1 Cubic Foot Air Xtreme 170PKX 043038		GET
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Submersible Systems 1 Cubic Foot Air Xtreme
 
You save $44.01
$230.99
 Mfg Part #:100PK
Mares Rover Octo 100PK 035079

Mares Rover Octo
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$118.95
 Mfg Part #:416505
Atomic ST1 Octo 416505 035067

Atomic ST1 Octo
  Free Standard Shipping
Atomic ST1 Octo
Customer Reviews
$430.00
 Mfg Part #:02-0215-3P
Mares Carbon Octo 02-0215-3P 035074

Mares Carbon Octo
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You save $41.05
$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
Customer Reviews
You save $7.05
$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
ScubaPro R095 Octo 15230 035082

ScubaPro R095 Octo
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ScubaPro R095 Octo
Customer Reviews
$139.00
 Mfg Part #:11.330.200
Oceanic Air XS II 11.330.200 004571

Oceanic Air XS II
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Oceanic Air XS II
Customer Reviews
You save $10.00
$169.95
 Mfg Part #:08.7020
XS Scuba Altair Octo 08.7020 035251

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

Aeris A2 Maxflex Octo
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You save $6.00
$129.95
 Mfg Part #:30.0216
TUSA SS60 Octo 30.0216 035104

TUSA SS60 Octo
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You save $39.96
$119.99
 Mfg Part #:SS-60
Apeks XTX40 Octo SS-60 035092

Apeks XTX40 Octo
  Free Standard Shipping
$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
Customer Reviews
You save $21.05
$238.95
 Mfg Part #:416504
Aqua Lung Titan LX Octo 416504 035097

Aqua Lung Titan LX Octo
  Free Standard Shipping
$215.00
 Mfg Part #:128140
Aqua Lung Mikron Octo 128140 035098

Aqua Lung Mikron Octo
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$210.00
 Mfg Part #:127849
Zeagle CW Octo 127849 035073

Zeagle CW Octo
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You save $3.05
$189.95
 Mfg Part #:320-5010
Mares MV Octo 320-5010 035046

Mares MV Octo
  Free Standard Shipping
Mares MV Octo
Customer Reviews
You save $80.05
$69.95
 Mfg Part #:416523
Aeris Air Link 416523 035019

Aeris Air Link
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Aeris Air Link
Customer Reviews
You save $10.00
$149.95
 Mfg Part #:40.9100
SubGear Aruba Octo 40.9100 035083

SubGear Aruba Octo
  Free Standard Shipping
$123.00
 Mfg Part #:811.294.010
Submersible Systems Spare Air Safety Leash 14-0055-3P 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
  Free Standard Shipping
$215.00
 Mfg Part #:AA0425

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