Abstract: The pipette tip packaging and transfer system comprises a plurality of receiving plates and a transfer member. Each receiving plate includes a plurality of openings for receiving pipette tips in a substantially vertical alignment at a medial position thereof. The loaded receiving plates can be stacked one atop of another with the pipette tips contained within a first receiving plate being received in the top openings of the aligned pipette tips contained within the underlying receiving plate of the stack. The transfer member has a plurality of projections extending from the bottom surface of the transfer member at positions that correspond to the location of the openings of the receiving plate. The projections are configured and arranged to extend into the top openings of the pipette tips on the upper-most receiving plate and maintain the pipette tips in a fixed and substantially perpendicular alignment in relation to the transfer member and receiving plate.

Abstract: An annular sealing ring with a generally Y-shaped cross-section for sealing between a piston and the curved wall of a cylinder. The sealing ring includes a base with one or more horizontal ribs extending outwardly from each side thereof and a pair of lips with sealing edges, the lips being spaced apart to form a cavity therebetween wherein a solid, elastic expander ring is retained. The cavity is bounded by the similarly opposed inner surface of the lips. The expander ring is seated in a portion of the cavity so that a void is created in the cavity below the expander ring.