... .63.40-1806JLM10021020-1806JLM1202121.50-1806JLM15011510-1806Features1.Manual control the stroke frequency from 10-100%,LED display the normal frequency(at ... stop)2.Drive by electromagnetism,simple design,the speed of stroke is adjustable.3.Easy to install, the pump is together ... , daily chemicals, food industry, constructions industry, and etc.Measurements JLM Solenoid Diaphragm Metering Pump