Dosatron D20S

Large-Format Water-Powered Proportional Injector, 5-100 GPM – D20SVFII

The Dosatron D20SVFII (D20S) is a large-format water-powered proportional injector designed for high-flow commercial and industrial fertigation applications. With a flow range of 5 to 100 GPM and a 2-inch NPT connection, the D20S is sized for facilities where the D14 series (14 GPM max) or the D40MZ series (40 GPM max) would restrict water throughput.

The D20S operates on the same water-powered proportional dosing principle as all Dosatron injectors — water pressure drives the piston that draws concentrate from a container and blends it with the water supply at a fixed ratio. The dilution range of 1:500 to 1:50 (0.2% to 2%) covers standard nutrient application rates for high-volume irrigation. The unit includes mounting bracket, manual bypass, suction hose with strainer and weight, vacuum breaker, and a set of legs for freestanding installation. Weight is 47 lbs.

Key Features & Benefits

• 5-100 GPM Flow Range — Handles high-flow commercial and industrial applications where smaller Dosatron units would be a restriction.
• 2-Inch NPT Connections — Large-bore connections for high-flow plumbing systems.
• 1:500 to 1:50 Dilution Range — 0.2% to 2% concentration — appropriate for most liquid nutrient programs.
• 2-120 PSI Operating Pressure — Wide pressure range for compatibility with various supply configurations.
• Legs Included — Optional freestanding legs allow installation without a wall-mounting structure.
• Vacuum Breaker Included — Prevents backflow from the suction line into the concentrate container in vacuum conditions.

Who Should Use This Injector

The D20SVFII is for large commercial facilities where irrigation demand exceeds what the 40 GPM D40MZ series can supply — nurseries, greenhouses, large indoor facilities, and municipal irrigation installations. It is also appropriate for situations where a single high-capacity injector is preferred over installing multiple lower-flow units in parallel.

When to Use the D20S vs. Multiple D40MZ Units in Parallel

Dosatron D40MZ injectors can be installed in parallel to increase total system flow capacity — two D40MZ units in parallel can handle up to 80 GPM, and three up to 120 GPM. The D20SVFII provides up to 100 GPM from a single unit, simplifying installation when a single injector is preferred over a parallel array. A parallel D40MZ installation requires a flow-balancing manifold to ensure each injector receives equal flow and doses correctly. A single D20S eliminates this complication at flow rates up to 100 GPM. For flow requirements above 100 GPM, parallel D20S units or a custom manifold design may be needed.

Frequently Asked Questions

What is the flow range of the D20SVFII?

5 to 100 GPM at 2 to 120 PSI, sized for facilities where smaller Dosatron models would restrict water throughput. That range covers most commercial and industrial fertigation demands in a single unit.

What connection size does it use?

2-inch NPT, a large-bore connection appropriate for high-flow plumbing systems. That bore size is what allows the unit to pass up to 100 GPM without excessive pressure drop.

What is the dilution range?

1:500 to 1:50 (0.2% to 2%), covering standard nutrient application rates for high-volume irrigation. That's the same range used by the D14MZ2 and D40MZ2 models, just scaled to a much higher flow rate.

How much does the D20S weigh?

47 lbs. The included legs support that weight for freestanding installation without requiring a wall-mount structure.

What accessories are included?

Mounting bracket, manual bypass, suction hose with strainer and weight, vacuum breaker, and a set of freestanding legs. That's the complete hardware set for installing and running the unit out of the box.

Can it be installed without wall mounting?

Yes, the included legs allow freestanding installation, which is useful in facilities without a suitable wall-mounting location near the plumbing. That flexibility simplifies siting the unit in larger mechanical rooms.