Chemical Storage Tanks, Tank Systems, Tank Mixers and Agitators, Calibration Columns, Liquid Flow Indicators, Liquid Level Monitors with Alarm, Water Flow Meters, Large Pipe Injection Valves, etc. Calibration Cylinders for the accurate calibration of metering pumps. Back Pressure and Pressure Relief Valves to enhance the accuracy and safety of metering pumps. Pulsation Dampeners to remove pulsating flows from positive displacement pumps. Injection Valve Quills to allow chemical injection into the center stream of the flow. Corporation Stops to inject chemical into the center stream of the flow and provide an isolation valve for easy maintenance.