Abstract: A pair of inflatable erecting tubes and a pair of inflatable reservoir tubes project from opposite ends of a pump unit including a rigid valve body molded as an insert within a pump body of resilient silicone material. The inflatable tubes are implanted within the right and left corpora cavernosa of the penis with the pump unit located at the base of the penis transecting the medial corporal septum. The valve body has a series of passages and spring biased one way valves which are effective to inflate the erecting tubes in response to the application of a squeezing pressure to opposite sides of the pump body and to delfate the erecting tubes in response to downward pressure on the pump body.