Abstract: A closure is provided for a syringe of the type having a housing with a substantially tubular and cylindrical neck with a through bore through which the contents of the syringe are dispensed. The closure includes an elongated probe having a free end and a cross-sectional area substantially the same as the syringe through bore. The closure further includes a first and second tubular and cylindrical sealing ring. The first tubular and cylindrical ring has an inner diameter substantially the same as the outer diameter of the syringe neck while the second sealing ring is positioned concentrically around the first sealing ring. The sealing rings and probe are dimensioned so that, upon insertion of a free end of the probe into the syringe through bore, the probe and first sealing ring sealingly engage both the internal and external surfaces of the syringe neck. Simultaneously, the free ends of the first and second sealing ring sealingly engage the outer surface of the syringe housing.