and associated side pocket mandrels and are incorporated herein by reference in their entirety to provide some background in this area to begin side pocket mandrels serve as a down hole receptacle for slickline retrievable gas lift barrier valves and flow control devices side pocket mandrels contain an offset pocket the pocket configuration can allow the insertion and retrieval of a gas lift barrier valves or flow control devices of various numbers types and sizes with a slickline conveyed kick over running and or pulling tools the gas lift barriers and flow control devices can incorporate an integral in line reverse flow check valve to prevent well fluids from flowing in a reverse direction through the valve or flow control device when installed with a gas lift barrier or flow control device in a side pocket mandrel this reverse flow check valve also serves as a pressure barrier between the flow conduits and allows injection or fluid flow in only one direction when the valve or flow control device with the integral check valve is removed from the side pocket mandrel well fluids are no longer adequately prevented from flowing in a reverse direction and as such there can be a communication between the production conduit and the casing annulus it is desirable to have a design that can facilitate the operation installation and retrieval of gas lift barrier valves and flow control devices as similarly described above while providing a capability and capacity to maintain a pressure barrier between the production and casing annulus when and after a gas lift barrier valve or flow control device is retrieved from the side pocket mandrel pocket along those lines the present application includes various embodiments.