A) 25 bar test pressure Aluminium alloy or ductile iron housing protected by an outer and inner coating of epoxy resins.

B) Hydraulically balanced Tubular diaphragm (P.T.F.E.- Viton®, EPDM, Hypalon®) or Neoprene)

C) Ball check valves (P.T.F.E.- Viton®,EPDM,Neoprene) ; or P.T.F.E. "shuttles" valves for increased dry suction lifts (see "SH/DSL" range)

D) Very solid flat air diaphragm (natural rubber, Neoprene, Silicone rubber, Viton/Neoprene, HNBR) is part of the secondary containment.

E) Hydraulic inert liquid (water, glycol, glycerin, silicone oil or other compatible liquids on demand).

F) Pneumatic air distributor: operated by filtered, clean and oil-free compressed air. All moving parts are cylindrical and all gaskets are of the self lubricated O-ring type. An integrated stroke frequency controller for adjusting the pump cycles is supplied within the standard pilot valve. Fitted with very efficient exhaust air silencers. Optionally available is a totalizing-predetermining impulse counter (batch controller) or remote control unit 3-15 psi (pneumatic actuator) transducers for 4-20 mA or other electrical signals can also be supplied.