How a Penis Pump Works
Placement: The plastic tube (cylinder) is placed over the flaccid penis.
Vacuum Creation: The pump removes air from the tube, creating a vacuum.
Erection: The vacuum draws blood into the penis, causing it to become erect.
Erection Maintenance: A constriction ring is then slipped over the base of the penis to hold the blood in place.
Removal: The penis pump is removed, and the ring is left on for sexual activity.