A penile prosthetic (20) includes an inflatable member (24) that is implantable into a penis of a user, a reservoir (22) that is implantable in an abdomen, and a pump (26). The pump is configured to be attached between the inflatable member and the reservoir and is implantable in a scrotum. The pump includes a pump bulb (42) formed by first and second end sections (50, 52), a mid-section (54) and concave portions (58).