GLA PRO-DS-3 Dual Stage CO2 Regulator (3 Block Modular Manifold)

GLA PRO-DS-3 Dual-Stage CO2 Regulator (3-Block Modular Manifold)

Dual-stage CO2 control for three aquariums, with room to expand.

The GLA PRO-DS-3 Aquarium CO2 Regulator combines dual-stage pressure regulation, precise CO2 adjustment, and automatic operation in a full-size design. Its three-block modular manifold allows you to supply three planted aquariums from a single regulator and CO2 cylinder.

Each manifold outlet includes its own precision needle valve and bubble counter, allowing CO2 flow to be adjusted independently for each aquarium. Dual pressure gauges provide separate monitoring of cylinder pressure and adjustable working pressure.

Compatible manifold blocks can be added later to support up to six aquariums. Every GLA PRO-DS regulator is individually inspected, pressure tested, and leak checked in the USA before shipment.

At a Glance

• Pressure Regulation: Dual-stage design
• Cylinder Connection: CGA-320 standard USA CO2 cylinders
• Included Manifold: Three independently adjustable CO2 outlets
• CO2 Adjustment: Precision needle valve for each outlet
• Flow Monitoring: Bubble counter for each outlet
• Automation: Integrated electric solenoid
• Pressure Monitoring: Separate cylinder-pressure and working-pressure gauges
• Expansion: Modular manifold supports up to six aquarium outlets
• Warranty: GLA Limited Lifetime Warranty

Best For

• Three planted aquariums sharing one CO2 cylinder
• Aquarists who want independent CO2 adjustment for each aquarium
• Planted aquariums with different sizes or CO2 requirements
• Full-size dual-stage CO2 installations
• Multi-aquarium systems with future expansion in mind
• Aquarists who want separate cylinder-pressure and working-pressure gauges
• Automated daily CO2 operation with a timer or compatible controller

Why Choose the GLA PRO-DS-3?

PRO-DS-3 combines dual-stage pressure regulation, three independently adjustable CO2 outlets, dual-gauge monitoring, and modular expansion in one regulator. Here's how its features benefit your aquarium installation.

• Dual-Stage Pressure Regulation: Reduces cylinder pressure in two stages to help maintain consistent working pressure as cylinder pressure changes, including near depletion.
• Three Independent CO2 Outlets: Supply three planted aquariums from one regulator and CO2 cylinder, with separate flow adjustment for each aquarium.
• Precise CO2 Adjustment: Each manifold block includes its own precision needle valve, allowing you to fine-tune CO2 delivery for different aquarium requirements.
• Separate Pressure Gauges: One gauge displays cylinder pressure, while the other displays the regulator's adjusted working pressure. Both can be monitored independently.
• Expandable Modular Manifold: Start with three CO2 outlets and add compatible manifold blocks later to supply up to six aquariums from one regulator and cylinder.
• Individual Bubble Counters: Each manifold outlet includes a bubble counter that provides a visual reference when adjusting CO2 flow to its connected aquarium.
• Automatic CO2 Control: The integrated electric solenoid allows CO2 injection to turn on and off automatically using a timer or compatible controller.
• Integrated Protection: A pressure relief valve provides additional protection, while multi-stage stainless steel micron filtration helps protect internal regulator components from contamination.
• Durable Construction: A precision metal-on-metal valve seat and quality pneumatic components are designed for dependable long-term operation.
• USA Inspection & Testing: Every PRO-DS regulator is individually inspected, pressure tested, and leak checked in the USA before shipment.

Expandable Modular Manifold System

PRO-DS-3 includes three modular manifold blocks, each with its own precision needle valve and integrated bubble counter. This provides three independently adjustable CO2 outlets.

All three aquariums share the regulator's working pressure and automatic on/off schedule, but CO2 flow can be adjusted separately for each aquarium.

If you add more planted aquariums, compatible manifold blocks can be installed to expand your existing PRO-DS regulator.

• PRO-DS-1: One independently controlled CO2 outlet
• PRO-DS-2: Two independently controlled CO2 outlets
• PRO-DS-3: Three independently controlled CO2 outlets (included)
• PRO-DS-4: Four independently controlled CO2 outlets
• PRO-DS-5: Five independently controlled CO2 outlets
• PRO-DS-6: Six independently controlled CO2 outlets

Expanding Later: Compatible manifold blocks can be added as your aquarium collection grows, up to the six-outlet configuration.

View GLA Modular Manifold Expansion Blocks

What's Included

• GLA PRO-DS-3 Dual-Stage CO2 Regulator
• Three-block modular manifold
• Three precision adjustable needle valves
• Three integrated bubble counters
• Integrated electric solenoid
• Cylinder-pressure gauge
• Working-pressure gauge
• GLA OEM CO2 tank seal

What You'll Need Separately: A compatible refillable CO2 cylinder, CO2-resistant tubing, and a diffuser, inline atomizer, or reactor for each aquarium are required to complete your CO2 installations. These items are sold separately.

Need a cylinder too? Explore our GLA PRO-DS Complete CO2 System, which combines the PRO-DS regulator with a refillable aluminum CO2 cylinder and CO2-resistant tubing.

Technical Specifications

• Model: GLA PRO-DS-3 Dual-Stage CO2 Regulator
• Pressure Regulation: Dual-stage
• Cylinder Connection: CGA-320, standard USA CO2 cylinders
• Adjustable Working Pressure: 0–140 PSI
• Pressure Monitoring: Separate cylinder-pressure and working-pressure gauges
• Included Manifold: Three modular manifold blocks
• Standard CO2 Distribution: Three aquariums
• Multi-Aquarium Expansion: Up to six manifold outlets
• Flow Adjustment: Independent precision needle valve per outlet
• Flow Monitoring: Integrated bubble counter per outlet
• Automation: Integrated electric solenoid
• Pressure Relief: Integrated pressure relief valve
• Valve Seat: Laser-precision metal-on-metal
• Filtration: Multi-stage stainless steel micron filtration
• Expansion: Compatible GLA modular manifold blocks
• Manifold Compatibility: G2 and G3 components are not interchangeable
• Quality Control: Individually inspected, pressure tested, and leak checked in the USA

Frequently Asked Questions

What is the benefit of dual-stage pressure regulation?
Dual-stage regulators reduce cylinder pressure in two stages rather than one. This helps maintain consistent working pressure as cylinder pressure changes, including when the CO2 supply approaches depletion.

How many aquariums can PRO-DS-3 supply?
PRO-DS-3 includes three manifold outlets for three aquariums. Compatible expansion blocks can be added later to supply up to six aquariums from one regulator and CO2 cylinder.

Can each aquarium receive a different amount of CO2?
Yes. Each manifold outlet includes its own precision needle valve, allowing you to adjust CO2 flow independently for each aquarium. All three outlets share the same working pressure.

Can the three aquariums have different CO2 schedules?
The integrated solenoid switches all three manifold outlets on and off together. CO2 flow can be adjusted independently, but all aquariums share the same automatic operating schedule.

Can I use different CO2 diffusers on each aquarium?
Yes. Each outlet may supply a compatible ceramic diffuser, inline atomizer, or CO2 reactor. The regulator's working pressure is shared, so all three diffusion devices must be compatible with the selected pressure.

What do the two pressure gauges display?
One gauge displays CO2 cylinder pressure, while the second displays the regulator's adjustable working pressure. The cylinder-pressure gauge does not provide a precise measurement of remaining CO2.

Can I add more manifold blocks later?
Yes. Compatible GLA modular manifold blocks can be added. Make sure the expansion blocks match your existing regulator generation, as G2 and G3 components are not interchangeable.

What size aquariums can I use PRO-DS-3 with?
PRO-DS-3 can supply planted aquariums of various sizes. CO2 requirements depend on lighting, plant demand, circulation, and diffusion equipment rather than aquarium volume alone.

Does PRO-DS-3 include a CO2 cylinder?
No. This listing includes the PRO-DS-3 regulator, three manifold blocks, integrated components, and GLA OEM tank seal. A compatible cylinder, CO2-resistant tubing, and diffusion equipment are sold separately.

Pre-Sales & Installation Support

GLA provides expert pre-sales assistance, equipment compatibility guidance, and installation support by email and text. Whether you're selecting accessories or setting up your CO2 regulator, we're here to help.

Contact GLA for Assistance

Support & Warranty

Limited Lifetime Warranty: GLA CO2 regulators are covered against qualifying defects in materials and workmanship for the original purchaser. Coverage is non-transferable, requires proof of purchase, and is subject to proper installation, use, and maintenance. GLA may repair, replace, or issue store credit for qualifying claims.

Return Policy: Pressurized CO2 equipment is non-returnable and non-refundable. Qualifying defects are handled separately through warranty support.

Warranty Exclusions: Coverage does not include improper installation, misuse, excessive force, unauthorized repairs or modifications, contamination, corrosion, accidental damage, or normal wear. Damage from improper wrench use is excluded. Cylinders, tubing, cartridges, and other accessories are not covered under the regulator warranty unless otherwise specified.

For complete terms, exclusions, and claim requirements, please review our Shipping, Returns & Warranty Policy .