Capped piston pump

摘要: A disposable plastic pump for dispensing liquids is disclosed which comprises two basic unitary, preferably all plastic, elements: a chamber forming body having an open outer end and inner in fluid communication with liquid reservoir, piston formed to slidably fit into the chamber. The forms axially adjacent coaxial chambers, of one diameter different diameter. stem on located spaced flexing disc each sized serving as one-way valve chamber, respectively, permitting fluids flow outwardly past disc. sealing outermost passageway provided from inlet between through dispensed flow.