H2O Redundant Air System 4 RAS4-K13 043189


Mfg Part #: RAS4

H2O Redundant Air System 4

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Customer Reviews for H2O Redundant Air System 4:

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Questions and Answers for H2O Redundant Air System 4:

  • Kevin:

    does H2Odyssey redundant air system 4 come with the optional GPD pressure guage?

    Bill  (Certified Scuba Instructor at

    The GPD button gauge is optional and not included.

  • betty:

    Hi, How can I tell what kind of tank that is here at my house? I would like to sell it but do not know what it is. It is aluminum and says DOT 3 AL 3000. Do you know what it is? Thank you.

    Clarke  (Certified Scuba Instructor at

    Hello Betty, Thank you for your inquiry! The H2O Redundant Scuba Air System 4 Aluminum cylinder has a working/fill pressure of 3000psi. The Alternate Air Source system is available with a 13 or a 19 cubic foot tank. You can determine the size of the cylinder by a marking of “S13 or S19”, which is usually stamped after the hydro date on the tank. If you have other questions, need help or would like to place an order, please contact by calling 800-247-2822 <> 949-221-9300 or e-mail us at:

  • mohammad:

    hi im buying some basic diving gear and i was wondering how you can refill the oxygen tank when it runs out. im new to diving and would like my own gear instead of renting.

    Bob  (Certified Scuba Instructor at

    The AIR tanks are filled at your local dive shop or on the commercial dive boat you are diving with.

  • chris:

    Does this product have a QD for the secondary hose on the primary?

    Bill  (Certified Scuba Instructor at


  • Maria:

    What is the difference between the RAS 3 vs RAS4? Cant tell from product descriptions.

    Darrick  (Certified Scuba Instructor at

    Hello Maria, the difference is in the 2nd stage the RAS3 has a swivel built in to help eliminate jaw fatigue. When as the RAS4 does not have this feature.

RAS4 - H20 Redundant Air System 4

RG3V balanced diaphragm 1st stage with on/off valve
2nd stage connects via a vertical/horizontal swivel
Available in kits which include:

- 1st & 2nd stage
- 13 or 19 cubic foot tank
- Station Filler
- Tank mount bag - DB13 or DB19
- GPD button gauge (optional)

1st Stage

Balanced Diaphragm First Stage - RG3V

Balanced diaphragm
Environmentally sealed
Forged brass
On/Off valve
3 Low pressure ports & 2 high pressure port


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