GLA GRO Aquarium CO2 Regulator (DIN477)

GLA GRO Planted Aquarium CO2 Regulator (DIN477)

The GLA GRO CO2 Reglt single-stage regulator designed for international planted aquarium CO2 installations using compatible W21.8 × 1/14 cylinder connections.

Built around the same streamlined GRO regulator platform, this international configuration combines precise CO2 adjustment, automatic operation, integrated system protection, and GLA build quality in a clean, space-efficient design. Each regulator is individually inspected, pressure tested, and leak checked in the USA prior to shipment.

At a Glance

• Pressure Regulation: Single-stage
• Cylinder Connection: W21.8 × 1/14 international CO2 connection (DIN477 / compatible equivalents)
• Common Regional Standards: DIN 477, BS 341 No. 8, and compatible Type 30 CO2 cylinder connections
• Pressure Monitoring: Integrated working-pressure gauge
• Output Pressure Range: 0–70 PSI
• Standard Configuration: Single aquarium
• Expansion: Compatible with the optional GLA GRO CO2 Splitter
• Automation: Integrated electric solenoid
• Power Adapter: AU, EU, or UK configuration selectable at purchase
• Warranty: GLA Limited Lifetime Warranty

Best For

• Aquarists using compatible international W21.8 × 1/14 CO2 cylinders
• Planted aquarium installations in Europe, the United Kingdom, Australia, and other compatible international markets
• Single planted aquarium CO2 installations
• Aquarists seeking a compact and straightforward regulator platform
• Installations where space and clean equipment layout are priorities
• Hobbyists who want precise CO2 adjustment with automatic timer control
• Planted aquariums using diffusers, inline atomizers, or CO2 reactors

For aquarists who prefer dual-stage pressure regulation or a fully modular manifold platform, GLA also offers international DIN477 configurations of the DS-Mini and PRO-DS regulator platforms.

Why Choose the GLA GRO DIN477?

The GRO DIN477 provides the streamlined design and precise CO2 control of the GLA GRO platform with an international cylinder connection intended for compatible CO2 cylinders outside the United States.

• International Cylinder Compatibility: Designed for compatible W21.8 × 1/14 CO2 cylinder connections
• Compact Single-Stage Design: Streamlined configuration for clean, efficient installation
• Precision CO2 Adjustment: Fine-control needle valve allows careful tuning of CO2 output
• Automatic Operation: Integrated solenoid allows CO2 injection to be controlled by a timer or compatible controller
• Integrated Flow Monitoring: Bubble counter provides a convenient visual reference for CO2 delivery
• Backflow Protection: Integrated check valve helps protect the CO2 system from aquarium water backflow
• System Protection: Integrated pressure relief valve provides an additional level of protection
• Regional Power Options: AU, EU, and UK power adapter options are available

International Cylinder Compatibility

This regulator uses the W21.8 × 1/14 CO2 cylinder connection commonly associated with DIN 477 and equivalent international CO2 cylinder standards.

Depending on the country or cylinder supplier, compatible connections may be identified by different regional designations, including DIN 477, BS 341 No. 8, or Type 30.

Important: CO2 cylinder valve standards can vary by country, supplier, and cylinder type. Always confirm that your CO2 cylinder uses a compatible W21.8 × 1/14 connection before ordering.

Precision Control & Automation

The GLA GRO DIN477 combines a precision needle valve, electric solenoid, integrated working-pressure gauge, and bubble counter into a compact regulator assembly designed specifically for planted aquarium CO2 use.

The needle valve provides fine adjustment of CO2 flow, while the solenoid allows injection to be automatically coordinated with the aquarium photoperiod using a timer or compatible controller. The integrated working-pressure gauge provides a clear visual reference for regulator output pressure, and the bubble counter provides a convenient repeatable reference when tuning the system.

Bubble rate should be treated as an aquarium-specific reference rather than a universal CO2 measurement. Actual CO2 requirements vary with aquarium volume, plant mass, lighting, circulation, diffusion efficiency, and surface agitation.

Engineering & Performance

• Laser-Precision Metal-on-Metal Valve Seat: Engineered for consistent regulation and long-term operation
• Multi-Stage Micron Filtration: Filtration at the inlet and outlet helps protect internal pneumatic components
• 360° Adjustable Needle Valve: Allows flexible positioning during installation
• Integrated Working-Pressure Gauge: Provides a visual reference for regulator output pressure
• Integrated Pressure Relief Valve: Provides additional system protection
• Durable Aluminum Regulator Body: Compact construction designed for demanding aquarium environments
• Premium Pneumatic Components: Selected for precision, reliability, and long-term performance
• USA Inspection & Testing: Each regulator is pressure tested and leak checked prior to shipment

Specifications

• Installation: W21.8 × 1/14 international CO2 cylinder connection
• Connection Family: DIN 477 / compatible BS 341 No. 8 / Type 30 CO2 connections
• Pressure Reduction: Single-stage
• Pressure Monitoring: Integrated working-pressure gauge
• Output Pressure Range: 0–70 PSI
• Standard CO2 Distribution: One aquarium
• Multi-Aquarium Expansion: Optional GLA GRO CO2 Splitter available separately
• Power Adapter: AU, EU, or UK option selected at purchase

What’s Included

• GLA GRO CO2 Regulator with international DIN477-style cylinder connection
• Integrated electric solenoid
• Integrated working-pressure gauge
• Precision needle valve
• Integrated bubble counter with check valve
• Selected AU, EU, or UK power adapter
• GLA OEM CO2 tank seal

Please Note: A compatible CO2 cylinder, CO2-resistant tubing, and a compatible diffuser, atomizer, or reactor are required to complete the CO2 installation and are sold separately.

Optional Multi-Aquarium Expansion

The GLA GRO DIN477 is designed primarily as a streamlined single-aquarium regulator but can be expanded using the optional GLA GRO CO2 Splitter.

Each splitter outlet includes its own precision needle valve, allowing CO2 flow to be adjusted independently for each connected aquarium.

• Expand one GRO regulator to multiple aquariums
• Independent CO2 adjustment for each outlet
• Direct compatibility with the GLA GRO regulator platform
• Compact expansion without replacing the regulator

View GLA GRO CO2 Splitter

Frequently Asked Questions

What CO2 cylinders does the GRO DIN477 fit?
This regulator is designed for compatible W21.8 × 1/14 CO2 cylinder connections commonly identified as DIN 477 and related international standards. Depending on the region, compatible cylinder valves may also be identified as BS 341 No. 8 or Type 30. Always verify the actual cylinder valve connection before ordering.

Will this regulator work in Europe, the UK, or Australia?
It is designed for the W21.8 × 1/14 CO2 connection family commonly used in these markets. However, cylinder standards can vary by supplier and location, so compatibility should be confirmed with the cylinder provider before purchase.

Does the regulator include the correct electrical adapter for my country?
AU, EU, and UK power adapter options are available. Select the appropriate power adapter configuration when ordering.

Is the GLA GRO DIN477 a dual-stage regulator?
No. The GRO is a precision single-stage regulator designed around a compact and straightforward planted aquarium CO2 configuration. International versions of the GLA DS-Mini and PRO-DS are available for aquarists who prefer dual-stage pressure regulation.

Can the GRO DIN477 run more than one aquarium?
Yes. The optional GLA GRO CO2 Splitter can be added to provide independently adjustable CO2 outlets for multiple aquariums. For larger modular installations, a GLA dual-stage regulator platform may provide a more integrated expansion configuration.

Can I use a diffuser, inline atomizer, or CO2 reactor?
Yes. The adjustable 0–70 PSI output allows the GRO DIN477 to be configured with many planted aquarium CO2 delivery methods when operated within the pressure and flow requirements of the selected equipment.

What size aquarium can I use the GRO DIN477 on?
The regulator itself is not limited to a specific aquarium volume. Appropriate CO2 delivery depends on plant demand, lighting, circulation, diffusion method, surface agitation, and overall system configuration.

Is the GRO DIN477 suitable for beginners?
Yes. The GRO provides a straightforward pressurized CO2 platform while retaining precise adjustment, automatic solenoid control, integrated flow monitoring, pressure monitoring, and the component quality expected from GLA equipment.

Choosing the Right GLA CO2 Platform

The GLA GRO DIN477 is our streamlined international single-stage platform for aquarists using compatible W21.8 × 1/14 CO2 cylinders. The international DS-Mini combines dual-stage pressure regulation with a compact modular design, while the international PRO-DS provides GLA’s full-size dual-stage architecture with expanded pressure range, dual-gauge instrumentation, and modular configuration options.

Each platform is designed for a different installation style and level of system flexibility.

Compare GLA CO2 Regulators & Systems

GLA CO2 Equipment

Green Leaf Aquariums specializes in planted aquarium CO2 equipment engineered around precision, reliability, and long-term performance. GLA regulator systems are built specifically for the demands of nature aquariums and high-tech planted aquarium environments.

Each GLA regulator is individually inspected and tested in the USA prior to shipment to help ensure dependable operation and consistent performance.

Support & Warranty

Return Policy: Due to the technical nature of pressurized aquarium CO2 equipment, this item is non-returnable and non-refundable. Qualifying defects remain covered under the GLA Limited Lifetime Warranty and are handled separately through warranty support. Please contact GLA prior to ordering if you need assistance with product selection, installation, or compatibility.

• Limited Lifetime Warranty: Regulator covered against qualifying defects in materials and workmanship
• Lifetime Support: Expert assistance available
• Installation Guidance: We’re here to help you get started

Limited Lifetime Warranty: GLA CO2 regulators are covered by a limited lifetime warranty against defects in materials and workmanship for the original purchaser. This warranty is non-transferable and applies only when the product is used in accordance with Green Leaf Aquariums, LLC (GLA) guidelines and standard operating practices.

Warranty coverage applies only to products purchased directly from greenleafaquariums.com or authorized sales channels. Proof of purchase is required for warranty claims.

This warranty does not guarantee product performance for the lifetime of the purchaser. Product lifespan may vary based on usage, installation, maintenance, and operating conditions.

• Coverage applies only to manufacturing defects under normal use
• GLA reserves the right to repair, replace, or issue store credit at its sole discretion
• If a product is discontinued, a comparable replacement or credit may be provided based on product condition and age

Warranty Exclusions:

• Improper installation, misuse, neglect, or accidental damage
• Use of improper tools, fittings, or excessive force
• Modifications, alterations, or unauthorized repairs
• Damage caused by contamination, corrosion, or improper gas supply
• Normal wear, cosmetic wear, or external damage that does not affect normal functionality

Important: A wrench should only be used to secure the regulator to the CO2 cylinder. Damage resulting from improper use of tools, excessive force, or incorrect installation methods is not covered under this warranty.

GLA is not responsible for damage caused by improper installation or use. However, repair services and support may be available for a fee.

CO2 cylinders, tubing, cartridges, and other consumable or accessory items are not covered under the regulator warranty unless otherwise specified.

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