Dosatron D20S (D20SVFII): Precise, simple, and reliable are the best way to describe the D20S – 100 Gallon per Minute Dosatron. Installed directly in the irrigation line, the Dosatron is water-powered and does not require electricity. When the water activates the Dosatron, it proportionally doses the required percentage of chemical concentrate based on the amount of water entering the unit. Inside the Dosatron, the concentrate is mixed with the water and dispensed as a ready-to-use solution. The quantity of concentrate injected will maintain direct proportionality to the volume of water, regardless of variations in flow or pressure. Accessories include the following: - Manual bypass (on/off) - Suction hose with weighted strainer - Set of 4 legs for mounting - Suction hose with strainer - Vacuum breaker valve"