The D40MZ2 is a versatile, high-flow dosing injector designed for applications that require accurate chemical injection and dependable performance across a wide range of operating conditions. Powered entirely by water flow, it delivers proportional dosing ratios from 1:500 to 1:50 (0.2% to 2%), automatically maintaining the selected concentration as water demand changes. This ensures consistent chemical delivery for applications such as water treatment, industrial processing, cleaning systems, agriculture, and other operations where dosing accuracy directly impacts results. With a flow capacity of 2.2 to 40 GPM, the D40MZ2 combines precision dosing with the ability to handle larger volumes, helping improve process consistency while reducing chemical waste and operating costs.
- Connection Size: 1 1/2" NPT
- Percentage Range: .2% to 2%
- Unit Weight: 12 lbs
- Flow: 2.2 to 40 GPM (8.32 to 151 LPM)
- Pressure: 4.3 to 116 PSI
- Dimensions: 25 1/4” x 8 1/2”
- Ratio Range: 1:500 to 1:50
Included Accessories: Mounting bracket, suction hose, weighted strainer, and quick start guide.
Pressure loss

For optimal dosing performance, the D40MZ2 should be installed on a properly sized line with adequate upstream filtration to protect the injector from debris and maintain long-term reliability. Isolation valves are recommended to simplify maintenance and allow the unit to be serviced without shutting down the entire system. Positioning the chemical concentrate container close to the injector and minimizing suction lift helps ensure stable chemical pickup and accurate dosing. Where required, backflow prevention devices should be incorporated to protect both the water supply and chemical inventory. A well-designed installation helps maximize injector life, improve chemical efficiency, and ensure reliable operation across a broad range of commercial, agricultural, and industrial applications.
Every application is different. Flow rates, water quality, chemical compatibility, and installation requirements all impact the best injector configuration.
Contact a Dosatron expert today to determine the ideal setup for your application.
Find your maintenance kit in seconds — just check how long your pump has been in service.
Time in service | Recommended kit | Why | Buy Now |
|---|---|---|---|
Under 6 months | Mini Maintenance Kit | Quick refresh of the wear parts that go first — keeps dosing accuracy on spec. | Click here |
6 months – 2 years | Seal Kit | Replaces the seals and O-rings before leaks and dosing drift start. | Click here |
Over 2 years | Rebuild Kit | A full internal overhaul — restores your pump to factory performance. | Click here |
Over 5 years | Talk to our team | At this stage the motor piston typically needs replacing. We'll confirm the right solution for your unit. |
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Need a single replacement part instead of a full kit?
D40MZ SERIES SPOTLIGHT
Tom Talk – Dosatron Injector Mastery: Unleashing Precision with D40MZ Series
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