Described is a priming device to prime a gas from a fluid delivery system. A housing defines a fluidly coupled chamber and an inlet and includes a surface extending circumferentially outward from a longitudinal axis of the priming device and disposed between the chamber and the inlet port. An opening extends from within the chamber through the surface to outside the housing for gas to exit the chamber and a valve extending from the inlet port toward the chamber. The valve seals the inlet port and in an open position the valve does not seal the inlet port. A cover body has an open first end to couple with a male luer connector and an open second end to couple with the inlet port of the housing and disposed along the longitudinal axis, wherein the cover body is moveable relative to the housing.