Hollis : Picture 1 regular $239.95

About Hollis DC1 First Stage Only

The Hollis DC1 1st Stage Regulator is an Over-Balanced Diaphragm Regulator Design that provides progressively greater intermediate pressure as depth and gas density increases for superior gas delivery under the most extreme conditions. The diaphragm membrane transmits the pressure changes to the internal mechanism eliminating the need for the surrounding water to enter the intricate mechanism. The benefit of this type of first stage design is that none of the internal parts are exposed to contaminants such as salt, sand, chlorine or pool acids. These environmental contaminants cause corrosion and mineral deposits to form on the internal mechanism deteriorating regulator performance. The standard Diaphragm Regulator does allow water into the Mainspring Chamber so that the Diaphragm can perform this Transmission of Pressure Changes.

With the DC1 there is a Secondary Environmental Diaphragm Membrane that Seals off the Spring Chamber keeping the First Stage completely Sealed off from the Environment adding a Second-Layer of Corrosion Resistance and the Environmental Sealing Prevents Icing of the First Stage, allowing the Regulator to withstand the rigorous CE standard for coldwater performance.

The First Stage has 5 Low Pressure Ports (LP) with 3/8" Threads and 2 High Pressure Port (HP) with 7/16" Threads. The LP Ports are mounted on a Swivel Turret that allows for ideal low pressure hose routing. One Low Pressure Port points directly down from the first stage providing Easier Hose Routing for Back Mounted Double, Side Mount Cylinders or even for Recreational Divers. The DC1 First Stage Regulator is manufactured from Marine-Grade Chrome Plated Brass and is Nitrox compatible to 40% out of the box. The Regulator weighs 34.88 oz (989 g), is available in a Yoke or DIN Cylinder Connection comes with a CD Owner's Manual and is covered by a 24 month limited warranty.

Warranty Information

This product has a limited warranty of 24 months.

(510) 729-5110

Hollis DC1 First Stage Only Features

  • Over-Balanced Diaphragm Regulator Design
  • Provides Progressively Greater Intermediate Pressure with Increased Depth and Gas Density
  • Superior Gas Delivery Under Most Extreme Conditions
  • Dual Diaphragm Design: Completely Seals Internal Components from Environment
  • Environmental Sealing Prevents Icing
  • Meets Rigorous CE Standard for Coldwater Performance
  • 5 Low Pressure Ports (LP) with 3/8" Threads
  • LP Port Swivel Turret Allows Ideal LP Hose Routing
  • Easier Hose Routing for Back Mounted Double, Side Mount Cylinders or Recreational Divers
  • 2 High Pressure Port (HP) with 7/16" Threads
  • Material: Marine-Grade Chrome Plated Brass
  • Nitrox Compatible to 40% Out-of-the-Box
  • 2 Choices: Yoke or DIN Cylinder Connection
  • Weight: 34.88 oz (989 g)
  • CD Owner's Manual
  • 2 Year Limited Warranty

Hollis DC1 First Stage Only Specifications

1'St Stage Type
Over-Balanced Diaphragm
Lp Ports
Hp Ports
Nitrox Compatible
Yes Up To 40%
Marine-Grade Chrome Plated Brass
Total Weight
34.88 Oz (989 G)
Weight [with packaging]
Din: 2.1 lb,
Yoke: 2.45 lb
Mfr #

DC1 First Stage Only Customer Reviews

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Hollis GearHollis DC1 First Stage Only

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(1 of 1 customers found this review helpful)


A great 1st stage.

By Greg@ihpil

from west suburbs Chicago,Il

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      Comments about Hollis Gear Hollis DC1 First Stage Only:

      I had traded my older 1st stage in for this model.I own several Hollis products.The swivel turret is a nice feature.Aides in your hose arrangement& less strain.I feel confident it will serve me well.This 1st stage is a great value!! Leisure Pro has always been a good source for my needs in diving.Friendly help on the phone and prompt shipping.
      My diving is mostly done in the Carribean and some local,Midwest diving.

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

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