This semi-automatic self-refilling syringe with spring loaded plunger allows repetitive delivery of preset aliquots from a single reservoir. The handle has been designed to render fatigue free operation over an extended period of time. A detachable three way valve with corrosion resistant springs and stainless steel check valve balls ensures a repetitive accuracy of 1%.Ruggedly constructed for long life, the Wheaton Self-Refilling Syringe features an interchangeable ground glass barrel with Viton washers for resistance to corrosion. Plungers are Kanigen™ plated for corrosion resistance. All models are autoclavable. In order to accommodate a wide range of filling operations the Wheaton Self-Refilling Syringes are supplied with blunt end cannula with Luer lock, long and short chrome-plated intake/air vent cannula, sinker and silicone tubing.