Chemical metering pumps are solenoid-driven diaphragm liquid metering pumps designed for manual operation. The stroke length of the pumps is adjustable from 10% to 100% with the fixed stroke rate of 100 strokes per minute. Head and filling materials include glass filled polypropylrnr, Teflon ballsPyrex balls, VitonTeflon seats. The diaphragm is made of Teflon faced hypalon.The guided check valves provide precise seating and suction lift characteristics.