Abstract: A fluid transfer device utilizing a rotatable value assembly attached to two hollow core needles, which employs atmospheric air pressure to assist with the withdrawal of fluid from a first rubber stoppered container and during instillation of fluid into a second rubber stoppered container, permits air displaced from the second container to be evacuated therefrom. The device enables fluid to be withdrawn from a stoppered bottle with ease by eliminating the build up of a negative pressure in the bottle. Conversely, during instillation of fluid into a stoppered bottle, the device eliminates the build up of a positive pressure therein by the venting of displaced air.