Proportional, water-powered nutrient and additive injection — no electrical components required.
The Kobra Dosatak is a proportional, volumetric liquid dosing device driven entirely by water pressure. It automatically sucks, dilutes, and injects concentrate into your irrigation line at a ratio that stays locked to water volume — not pressure — so concentration stays consistent across your entire run.
The Kobra Dosatak is a proportional, volumetric liquid doser manufactured by Kobratec. It operates entirely on the mechanical force of water flowing through your existing irrigation line — no pump motor, no control board, no electrical connection of any kind. Water pressure drives an internal diaphragm system that draws concentrate from a reservoir, dilutes it, and injects the mixed solution downstream into the hydraulic network.
The defining characteristic of a volumetric proportional doser is that the injected dose scales directly with water volume passing through the unit — not with flow rate or line pressure. That means if your flow rate fluctuates between zones or over time, the concentration of what reaches your plants stays consistent. The Dosatak maintains that ratio within its specified operating limits without any manual recalibration.
The Dosatak Irrigation is designed for commercial cultivators who need repeatable, hands-off nutrient or additive injection across their drip or flood systems. It is a direct fit for licensed cannabis and hemp facilities running multi-zone drip irrigation where consistent EC at the root zone is non-negotiable.
It suits operations that want to remove electrical dosing equipment from wet environments — eliminating peristaltic pump failures, controller issues, and power-dependency from the fertigation equation. If your facility already has adequate water pressure and a well-designed irrigation layout, the Dosatak adds precision dosing without adding an electrical load, a controller subscription, or a failure point tied to power continuity.
It is also relevant for facilities that apply pH adjusters, sanitizers, or liquid additives alongside nutrient programs — the Dosatak handles any water-soluble liquid concentrate compatible with its diaphragm materials.
Proportional volumetric dosing: The injected product volume is always proportional to the volume of water flowing through the unit, regardless of flow rate or pressure variations within specified limits. This is the core difference between a true volumetric proportional doser and a venturi-style injector, which loses accuracy when pressure fluctuates.
No electrical components: The entire mechanism is driven by water pressure alone. The diaphragm system handles suction, dilution, and injection automatically — no power outlet, no controller, no relay. This eliminates a category of equipment failure and simplifies installation in grow rooms where electrical circuits near irrigation infrastructure are already crowded.
High-strength construction with a durable diaphragm: Built for environments with hard water and continuous daily cycling. The diaphragm system is engineered for long service life under commercial-use conditions.
Simple inline installation: The Dosatak installs directly into the irrigation pipe between the water source and the irrigation zone — no bypass plumbing required in most configurations. The unit ships with a mounting bracket, suction hose with inline filter, and user manual.
In a licensed cannabis or hemp facility, the Dosatak sits between your header line and the zone valves feeding your grow tables or beds. A stock tank of nutrient concentrate — sized to your run volume and target dilution ratio — feeds the doser's suction port. Every gallon that passes through the unit pulls the proportional dose of concentrate with it, mixing before it reaches your drip emitters or flood outlets.
Because the unit is water-powered, it can be positioned anywhere along the line without requiring an electrical drop nearby. This is particularly useful for satellite grow rooms, remote zones in larger facilities, or any build where running new circuits to a fertigation point is cost-prohibitive.
The Dosatak is compatible with nutrient concentrates, pH adjustment solutions, and liquid additives that are compatible with its diaphragm material — confirm compatibility with your specific concentrate formulations before deployment. For facilities running multiple crop stages simultaneously, individual Dosatak units can be dedicated per zone with separate concentrate tanks, allowing different feed recipes without cross-contamination or controller programming.
| Brand | Kobra (Kobratec) |
| SKU | DOS |
| Dosing Type | Proportional volumetric |
| Power Source | Water pressure only — no electricity required |
| Pump Mechanism | High-durability diaphragm system |
| Dosing Consistency | Proportional to water volume; maintained across flow rate and pressure variations within specified limits |
| Hard Water Compatibility | Yes — diaphragm engineered for hard water conditions |
| Installation Position | Inline, between water source and irrigation zone |
| Included Accessories | Mounting bracket, suction hose with filter, user manual |
| Suitable Inputs | Nutrient concentrates, pH adjusters, liquid additives (verify chemical compatibility) |
Because it is a volumetric proportional doser, the amount of concentrate injected is directly tied to the volume of water moving through the unit — not to line pressure or instantaneous flow rate. As more water moves through, more concentrate is drawn in at the same ratio. This keeps concentration consistent across pressure and flow variations within the unit's specified operating range, unlike venturi-style injectors that lose accuracy when pressure fluctuates.
No. The Dosatak is powered entirely by water pressure. There are no motors, solenoids, or control boards. It operates mechanically through its internal diaphragm system — making it suitable for wet environments where adding electrical equipment near irrigation lines is impractical or code-restricted.
The Dosatak is designed for water-soluble liquid concentrates including nutrients, pH adjustment solutions, and liquid additives. Compatibility depends on the chemical properties of your specific concentrate relative to the diaphragm materials. Always verify chemical compatibility with your chosen inputs before commissioning — particularly with strong acids or oxidizing agents.
Yes. Individual units can be dedicated to separate irrigation zones with separate concentrate reservoirs. This allows different feed programs — veg, early flower, late flower, flush — to run simultaneously without cross-contamination or the need to reprogram a centralized controller. Each unit is independent and self-contained.
The Dosatak ships with the doser unit, mounting bracket, suction hose with inline filter, and user manual. You supply the concentrate reservoir (any appropriately sized tank), your irrigation line connection fittings sized to your pipe diameter, and your nutrient concentrate. Confirm your line's operating pressure falls within the unit's specified range before installing.
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