Zeagle vs Atomic Aquatics
Envoy II Regulator vs ST1 Regulator
Which regulator would we put in our own kit?
Zeagle
Atomic Aquatics
Scores are our editorial opinion of these models, based on features, suitability and ownership trade-offs—not hands-on test results. How we chose →
We’d pick the ST1 Regulator.
We’d start with Atomic Aquatics ST1 Regulator. We like ST1 for buyers who specifically want a stainless-steel first-stage package in a sealed configuration. Choose Zeagle Envoy II Regulator instead if its strengths are a better match: our simpler pick for divers who want a balanced diaphragm first stage, useful port provision and familiar Venturi control.
Which one suits you?
Zeagle Envoy II Regulator
Our simpler pick for divers who want a balanced diaphragm first stage, useful port provision and familiar Venturi control. Its second-stage controls are less extensive than the F8's inhalation adjustment.
Get to know this model →Atomic Aquatics ST1 Regulator
We like ST1 for buyers who specifically want a stainless-steel first-stage package in a sealed configuration. We would not pay extra for the material without comparing complete-system weight and local servicing costs.
Get to know this model →Specifications side by side
The details that matter, side by side. “Check with the brand” means we have not confirmed that detail.
| Detail | Zeagle Envoy II Regulator | Atomic Aquatics ST1 Regulator |
|---|---|---|
| First stageCheck with the brand | Balanced diaphragm | Check with the brand |
| PortsCheck with the brand | 5 LP; 2 HP | Check with the brand |
| Second stageCheck with the brand | Downstream valve with Venturi control | Check with the brand |
| HoseCheck with the brand | 30 in / 0.76 m | Check with the brand |
| ConnectionCheck with the brand | DIN or yoke | Check with the brand |
| Material emphasisCheck with the brand | Check with the brand | Stainless steel |
| Package typeCheck with the brand | Check with the brand | First stage + second stage |
| Connections listedCheck with the brand | Check with the brand | DIN sealed; yoke sealed |
Showing all 8 specification rows.
What the differences mean when you buy
Exact first-stage configuration
Zeagle Envoy II Regulator
- First stage
- Balanced diaphragm
- Connection
- DIN or yoke
- Ports
- 5 LP; 2 HP
Atomic Aquatics ST1 Regulator
- Connections listed
- DIN sealed; yoke sealed
- Package type
- First stage + second stage
Start with the complete model and connection, including the selected sealed or unsealed variant. A family name can cover several configurations. Ask the dealer to confirm hose routing against the actual port arrangement and the approved cylinder connection. Missing port or sealing information should be resolved, not inferred from a nearby model.
Second-stage controls and construction
Zeagle Envoy II Regulator
- Second stage
- Downstream valve with Venturi control
Atomic Aquatics ST1 Regulator
Ask the brand about this detail before ordering.
Handle the purge and adjustment controls with your gloves and assess the mouthpiece fit. A Venturi lever and an inhalation adjustment are different controls. Exhaust placement and moisture-related features may be reasons to investigate a model, but they do not establish measured comfort, lower breathing effort or improved reliability without suitable comparative testing.
Materials and complete package
Zeagle Envoy II Regulator
- Hose
- 30 in / 0.76 m
Atomic Aquatics ST1 Regulator
- Material emphasis
- Stainless steel
Compare materials at the named component, not across the whole regulator by implication. A titanium-finish detail is not a titanium first stage. Obtain the assembled weight and package list if travel matters. A first-and-second-stage set may still need an alternate second stage, pressure measurement and inflator hoses before it matches your required configuration.
A closer look at both
Envoy II Regulator
The Envoy II is Zeagle’s simpler regulator set, pairing a balanced diaphragm first stage with a downstream second stage and Venturi control. It provides five low-pressure and two high-pressure ports and comes in DIN or yoke versions. The specified 30-inch hose is worth checking against your preferred routing.
What we like
Our simpler pick for divers who want a balanced diaphragm first stage, useful port provision and familiar Venturi control.
What would make us think twice
Its second-stage controls are less extensive than the F8's inhalation adjustment.
More about the Envoy II Regulator →ST1 Regulator
The ST1 is Atomic’s stainless-steel regulator option. The catalogue lists a first- and second-stage package with sealed DIN and sealed yoke variants.
What we like
We like ST1 for buyers who specifically want a stainless-steel first-stage package in a sealed configuration.
What would make us think twice
We would not pay extra for the material without comparing complete-system weight and local servicing costs.
More about the ST1 Regulator →Four checks before you place an order
- Ask an authorised dealer to identify the exact first stage, second stage, connection and sealing variant on the quotation.
- Have compatibility, operating conditions and hose routing checked for the equipment configuration you intend to use.
- Try the mouthpiece and controls, and ask what accessories and hoses are included.
- Obtain current inspection, servicing, warranty and parts-support requirements in writing, especially where a product page contains conflicting intervals.
Ask for a quote for the complete kit, including the accessories you need. That makes the price comparison much more useful.
Price, accessories and owning the equipment
Compare complete system quotations and local service support. A lower regulator-only price can be offset by missing components, shipping for servicing or incompatible existing hoses. No current matched price, service-cost history or breathing-machine result is available for every pair here, so we do not manufacture a value or performance score.
If replacing a functioning set, name the specific unmet requirement first: connection, supported configuration, controls, routing or service availability. Materials and range position alone do not prove that a replacement will breathe better. Installation and servicing should follow the manufacturer requirements through appropriately qualified support.
How we scored these models & further reading
These are our subjective buying scores out of 100. We weigh the usefulness of the features, the intended diving or carrying job, and the compromises involved in owning the gear. They are not laboratory measurements, safety grades or customer averages. The verdict applies to the two named models, not everything either brand makes.
90–100: one of our first choices for the stated job. 80–89: a strong option with trade-offs. 70–79: a more specific fit. A different fit, camera, valve or dive plan can change which one you should buy.
Zeagle Envoy II Regulator
Product details and further reading →Atomic Aquatics ST1 Regulator
Product details and further reading →Questions worth settling
Does an environmental seal prove cold-water suitability?
A seal is one documented design feature, not blanket approval for every temperature, configuration or diving use. Verify the exact set, current manufacturer instructions and applicable certification with qualified support. This article is a buying comparison, not regulator-configuration instruction.
Which is the better buy for this particular comparison?
Zeagle Envoy II Regulator: Its second-stage controls are less extensive than the F8's inhalation adjustment. Atomic Aquatics ST1 Regulator: We would not pay extra for the material without comparing complete-system weight and local servicing costs.
Our pick is where we would start. Choose the other model if its fit or features better match your setup—especially where a camera, valve, boot or exposure suit needs an exact match.
