Dosatron D8RE2 Water-Powered Doser, 40 GPM, 1:500 to 1:50, 1-1/2 in (D8RE2VFBPHY)

Dosatron D8RE2: Proportional Dosing Powered by Water Flow

This doser installs straight into the supply line and uses water pressure as its only power source. Water passing through drives a hydraulic piston motor inside the body. Each stroke draws a set amount of concentrate from your stock tank and mixes it with the incoming water. The mixed solution then moves on downstream to the irrigation lines. Because the motor speed follows the flow, the dose stays proportional whether the line runs fast or slow. The working range is 2.2 to 40 GPM, at line pressures from 0.15 to 8 bar. The ratio adjusts from outside the unit between 1:500 and 1:50, which is 0.2 to 2%. That works out to roughly 0.26 to 2.6 fluid ounces of concentrate per gallon of water. Connections are 1-1/2 in male threads, with water flowing in the direction of the arrows on the body. The unit stands just over 25 in tall and weighs about 7.3 lb. Maximum operating temperature is 104°F. It ships with a mounting bracket, suction tube, weighted strainer, bypass, union and quick start guide.

Setting Up a Fertilizer Injector on the Main Line

Mount the bracket on a wall or post where the unit stays upright and easy to reach. Dosatron recommends a filter upstream, around 300 mesh or 60 microns, and requires one for the warranty. Well water makes that filter even more important. Plumbing on a bypass lets clean water run without the doser and makes service simpler. Cut the suction tube to length and fit its strainer and weight. Hang the strainer at least four inches above the bottom of the stock tank so sediment stays out of the injector. The solution level must never sit above the water inlet, which prevents siphoning. Maximum suction height is about 13 vertical feet. To prime quickly, set the ratio to maximum, then dial back to your target once concentrate flows. The motor clicks as it runs, and two clicks equal one cycle. Count clicks over fifteen seconds to estimate flow through the line. Flush the unit with clean water after each use, especially with fertilizers that can crystallize.

Key Features

• Water-powered: No electricity; line pressure drives the piston motor.
• Proportional dosing: Dose follows flow across 2.2 to 40 GPM.
• 1:500 to 1:50 ratio: Externally adjustable from 0.2 to 2%.
• 1-1/2 in connections: Sized for main supply lines.
• Wide pressure range: Runs from 0.15 to 8 bar of line pressure.
• Bypass and union included: Service the doser while clean water keeps flowing.

Technical Specifications