Special: Doser for the Nutrient Delivery System Connection Size: 1 1/2" NPT Unit Weight: 12 lbs Dimensions: 26 3/8" x 8 1/2" Flow: 2.2 to 40 GPM (8.32 to 151 LPM) Pressure: 2.2 to 116 PSI Ratio: 1:3000 to 1:800 mL/gal: 1.25 to 4.85 mL Tsp/gal: 0.25 to 0.9 tsp Percentage (%): 0.03 to 0.125% Oz/gal: 0.043 to 0.160 Included Accessories: Mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide.