About Hollis DC7 First Stage Only

The Hollis Gear DC7 Regulator incorporates a High Performance Over-Balanced Diaphragm First Stage that provides Progressively Greater Intermediate Pressure as Depth and Gas Density Increases for Superior Gas Delivery under the Most-Extreme Conditions. This Regulator System is designed to withstand the Rigorous CE Standard for Coldwater Performance. The Balanced Diaphragm, First Stage Regulator is inherently Environmentally Sealed. The benefit of this type of First Stage design is that none of the Delicate Internal Parts are Exposed-to-Contaminants such as Salt, Sand, Chlorine or Pool Acids. These Environmental Contaminants can cause Corrosion and Mineral Deposits to form on the Internal Mechanism Deteriorating Regulator Performance. A Diaphragm First Stage Regulator requires Less-Maintenance then Regulators that allow the Contaminates to enter the Internal Mechanism.

In addition the DC7 First Stage Regulator has a Secondary Diaphragm to completely Seal-Off the Main Spring Cavity. A Sealed Balanced Diaphragm design; Isolate the Main Spring Cavities Internal Components from the Environment. It also means the DC7 is excellent for Ice Diving (it won't freeze up) or Diving in Waters Filled-with-Contaminants or Sediment (it won't corrode). This DIN 300 bar (4350psi) First Stage Regulator is manufactured from Marine Grade Brass with a Black Anodized Finish and has 4-Low Pressure (LP) 3/8" Threaded Fixed Ports and 2-High Pressure (HP) 7/16" Threaded Ports. The Fixed Hose Routing is Ideal for both Back Mount and Side-Mount Configuration. The Regulator is NITROX Compatible to 40% Out-of-the-Box. Regulator is covered by a 24 month limited warranty.

Hollis DC7 First Stage Only Features

  • Meet Rigorous CE Standard for Coldwater Performance
  • High Performance Regulator
  • Over-Balanced Diaphragm First Stage
  • Provides Progressively Greater Intermediate Pressure with Increased Depth and Gas Density
  • Dual Diaphragm Design: Completely Seals Internal Components from Environment
  • Environmental Sealing Prevents Icing
  • 4-Fixed Low Pressure Ports (LP) with 3/8" Threads
  • Fixed Hose Routing: Ideal for Back Mount and Side-Mount Configuration
  • DIN 300 bar (4350psi) First Stage Regulator
  • NITROX Compatible to 40% Out-of-the-Box
  • Marine Grade Brass with Black Anodized Finish
  • 2 Year Limited Warranty

Hollis DC7 First Stage Only Specifications

1'St Stage Type
Over-Balanced Diaphragm First Stage
Lp Ports
4-Fixed 3/8" Threaded
Hp Ports
2-High Pressure 7/16" Threaded
Nitrox Compatible
Marine Grade Black Anodized Brass
Weight [with packaging]
Din: 0.95 lb,
Yoke: 1.6 lb

DC7 First Stage Only Customer Reviews

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by PowerReviews
Hollis GearHollis DC7 First Stage Only

(based on 1 review)

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Reviewed by 1 customer

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awesome first stage

By eddiemack

from nh

About Me Advanced


  • compact
  • Effortless Breathing
  • Nitrox Compatible
  • reliable


    Best Uses

    • Cold Water

    Comments about Hollis Gear Hollis DC7 First Stage Only:

    Nice compact first stage reg. No issues while ice diving in 32 degree waters. Love it.

    • Diving Type:
    • ice
    • Was this a gift?:
    • No

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