A conversion device is provided that is effective for converting/adapting a spiked medical device/disposable to a valve/port on a container, such as for example a reflux-valve port on a container. The conversion device includes an attachment feature selected from a specified group such as male of female connector, cannula, male or female, luer and others. At least one membrane port is on an end opposite the attachment feature, and an intermediate structure is disposed between the attachment feature and membrane port.
