Special: Doser for the Nutrient Delivery System Connection Size: 1 1/2" NPT Unit Weight: 12 lbs Dimensions: 25 1/4" x 8 1/2" Flow: 2.2 to 40 GPM (8.32 to 151 LPM) Pressure: 2.2 to 116 PSI Ratio: 1:500 to 1:50 mL/gal: 7.5 to 75 mL Tsp/gal: 1.5 to 15 tsp Percentage (%): 0.2 to 2% Oz/gal: 0.256 to 2.560 Included Accessories: Mounting bracket, suction hose, bypass, union, weighted strainer, and quick start guide.