A method of inflating an implantable penile prosthetic includes providing the prosthetic with a lockout valve. The lockout valve is located in an inlet flow path between a reservoir containing liquid and a pump attached to the implantable penile prosthetic. The lockout valve has a core, an inlet flange connected to the core, a lockout flange connected to the core, an inflation channel formed through the core, a deflation pathway that is separate from the inflation channel and formed through a diameter of the core, and a one-way check valve disposed in the deflation pathway of the core. When a suction force is applied downstream from the reservoir, the core rotates, thus displacing the inlet flange and moving the liquid contained in the reservoir across the lockout valve and into the pump.
