Penis pump consists of a tube placed over the penis, a manual or battery-powered pump to remove air and create suction, and a constriction ring to maintain the erection by keeping blood inside the penis. Penis pumps are a non-drug treatment for erectile dysfunction (ED) and are used by placing the cylinder over the penis, operating the pump to achieve an erection, and then sliding the constriction ring onto the base of the penis to maintain the erection.