Abstract: The disclosure describes a check valve comprising a structure for channeling a flow of a first fluid and first and second porous elements for permitting flow of the first fluid and substantially preventing flow of a second fluid. The first and second porous elements extend across the channeling structure, engaging and sealing against the channeling structure to define a pocket between the first and second porous elements. The pocket contains the second fluid.

Abstract: The disclosure describes an administration set for providing a flow of fluid from a fluid container to a patient and comprising a section of tubing for channeling the fluid to the patient, an inlet spike attached to the tubing and connectable to the container for establishing a flow of fluid into the tubing, a connector attached to the tubing downstream from the inlet spike for sealingly receiving an inlet spike from a second administration set, and an arrangement operatively associated with the tubing and the connector for directing a flow of fluid into the inlet spike of the second administration set.