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About Scubapro C300 Regulator, Second Stage Only

The C300 offers uncompromising breathing performance for avid recreational divers. The C300 is lightweight 5.2 oz (175 g) with an anti-scratch cover. The C300 allows all the adjustments options of a high-end regulator while remaining a mid-range system. Optimal Flow Design valve (OFD) is for reliable and high airflow. Due to the incorporation of new technology that improves work of breathing performance compared to a classic downstream valve second stage.

The C300 has diver adjustable coaxial Venturi Initiated Vacuum Assist (VIVA) for powerful inhalation assistance and prevention of free flow and a diver adjustable inhalation control for personalized breathing effort. A redesigned mouthpiece tube allows better exhaust airflow, and an anti-scratch cover keeps it looking good for many years of diving activities.

The C300 housing is a precision molded carbon fiber and techno-polymer material for durability and impact resistance. If you are diving mixed gas the C300 is nitrox compatible and up to 100% oxygen concentration. A sturdy super-flow hose with Kevlar lining for extra durability and flawless air delivery, regulator is comfortable when in use with its orthodontic mouthpiece making the C300 the perfect choice for a primary second stage air source.

Scubapro C300 Regulator, Second Stage Only Features

  • Scubapro C300 Regulator, Second Stage
  • Optimal Flow Design (OFD) Valve
  • Lightweight 5.2 oz (175 g)
  • Diver Adjustable Coaxial VIVA
  • Adjustable Inhalation Control for Personalized Breathing Effort
  • Improved Exhaust Airflow
  • Anti-Scratch Cover
  • Carbon Fiber and Techno-Polymer Housing
  • Nitrox and Oxygen Ready
  • Super-Flow Kevlar Lined Hose
  • Orthodontic Mouthpiece

Scubapro C300 Regulator, Second Stage Only Specifications

Adjustable 2'Nd Stage
Nitrox Compatible
2'Nd Stage Type
Downstream Demand Valve
Carbon Fiber And Techno-Polymer
Hose Thread
Total Weight
5.2 Oz (175 G)
Mfr #

C300 Regulator, Second Stage Only Customer Reviews

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Scubapro C300 Regulator, Second Stage Only

(based on 2 reviews)

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Reviewed by 2 customers

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Works just fine


from Albuquerque, NM

About Me Casual/ Recreational


  • Effortless Breathing


  • Mouthpiece Large And Hard

Best Uses

    Comments about Scubapro C300 Regulator, Second Stage Only:

    I had to purchase this because I needed the first stage, which I purchased separately. My old SeaQuest second stage had a different fitting, so I had to go ahead and get this. (Bummer, because it was so much more expensive to do it this way.) Due to one other review, I was concerned when it made a terrible noise when breathing on land! However, it was fine in the water and I had no problem. I did find the mouthpiece to be quite large and hard. I swapped it out after a few days of diving, but not before I had a swollen lip! (Stupid on my part, as the switch was not difficult!)

    • Diving Type:
    • Open Water Diving
    • Was this a gift?:
    • No

    Comment on this review

    (1 of 1 customers found this review helpful)


    Annoying whistle

    By David

    from Chicago

    About Me Advanced


    • Comfortable
    • Nitrox Compatible


    • Poor Design

    Best Uses

    • Warm Water

    Comments about Scubapro C300 Regulator, Second Stage Only:

    I have been spoiled by my Scubapro MK25/S600 first stage and second stage. This regulator is so smooth and effortless that I hardly know I'm using it.

    I bought the MK17/C300 as a backup to my regulator and for my daughter to use on vacation. The first time I used the C600, I noticed a loud and annoying whistle on inhale. This was not an occasional problem. It happened every breath. The breathing is also substantially more labored than my MK25/S600. I know you get what you pay for, but the MK17/C300 is a marked disappointment. Next step is to contact LP and see about repair or replacement.

    If this is an isolated problem, I find it difficult to believe that such an obvious and immediate problem made it past both Scubapro's and LP's quality check.

    • Diving Type:
    • Drift Diving, Night Diving, Open Water Diving, Wreck Diving
    • Was this a gift?:
    • No

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