The LMI Milton Roy Series HH electromagnetic solenoid driven diaphragm pumps are 316 SS packed plunger pumps. These pumps have manually adjustable stroke length control providing accurate pump output adjustment. The time tested electronics are totally encapsulated for protection against moisture and corrosive conditions, owing to the reliable, repeatable performances. NEMA 4X / IP65 enclosures ensure protection against corrosive environments. The priming valves have Fluorofilm® diaphragms and ramp style knobs for hands free priming. Nova-Tech offers a variety of LMI HH series pumps including: HH1 (manual stroke length and stroke frequency control), HH7 (manual stroke length and selectable manual stroke frequency control or external pacing control), HH9 (LCD display, manual stroke length and selectable keypad stroke frequency control or external pacing control with pulse divide / multiply option from 1-999 or 4-20mA control).