• Product


The Dosatron D128R “Flat Top” medicator has been a customer favorite for over 40 years. The water-powered medicator uses the water from your main line to mix the perfect solution. Compatible with antibiotics and vitamins, electrolytes, nutritional supplements, and more. It is the perfect all-in-one medicator pump with ratio range settings of 1:128, 1:100, and 1:200.

The D128R mixes evenly, regardless of your main line’s pressure or flow, and passes through your lines, ensuring your livestock get precisely what they need.

  • Connection Size: 3/4" NPT
  • Percentage Range: 0.5 to 1%
  • Unit Weight: 4 lbs
  • Ounces Per Gallon Range: 0.640/1.000/1.280
  • Flow: 0.09 to 7 GPM (0.34 to 27 LPM)
  • Pressure: 7 to 70 PSI
  • Dimensions: 13" x 6 1/4"
  • Ratio Range: 1:200/1:128/1:100
  •   Included Accessories: Mounting bracket, suction hose, weighted strainer, and quick start guide.
  • Specification Sheet:
  • Recommended Accessories:   Click here for accessories
Recommended installations for your D128R


Dosatron model name definitions. OPTIONS

  • V: Identifies the type of hose (stands for Viscous)
  • BP: Units with bypass options
  • P: Identifies the type of housing (stands for PVDF or Kynar®)
  • IE: Units with side injection option
  • WL: Certified by NSF to NSF/ANSI 61 Standards
  • D: Car wash units
  • HY: Hydroponic / Nutrient Delivery System units
  • AF/VF: Identifies the type of seals (AF = Aflas® or VF = Viton®)
  • K: Kalrez®
  • II: Identifies the region (North/Central Am. – Dosatron International, Inc.)

All options are not available for every model. Please CHAT or CALL 1-800-523-8499 to find the best seal for the chemical you are injecting.


Check out our service, troubleshooting, and informational videos below.


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