Diaphragm piston pump Range | Equipment DIAPHRAGM PISTON PUMP The diaphragm piston pump: a pump designed to last SPEEDAIR is fitted as standard with a BP 60/20 (60 L/min, 20 bar) diaphragm piston pump. An economical pump with a straightforward design. This pump is non-corrosive (pistons are kept separate from the sprayed liquid). It is also feature