Special: Doser for the Nutrient Delivery System Connection Size: 1 1/2" NPT Unit Weight: 12 lbs Dimensions: 25 15/16" x 8 1/2" Flow: 2.2 to 40 GPM (8.32 to 151 LPM) Pressure: 2.2 to 116 PSI Ratio: 1:100 to 1:20 mL/gal: 37.5 to 190 mL Tsp/gal: 7.5 to 38 tsp Percentage (%): 1 to 5% Oz/gal: 1.280 to 6.400 Included Accessories: Mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide.