A non-sterile device intended to be used to create a barrier between the assay container and devices used for aspirating and/or depositing (e.g., pipette), to prevent reagent carryover and spillage, during in vitro diagnostic procedures. It may be used to perforate a sealed single or multichannel assay container and create a working channel for subsequent liquid handling. It is typically made of synthetic polymer materials (e.g., plastic) as a single component, or a strip of multiple liners. This is a single-use device.