Zero Gravity Penis PumpPenis vacuum pumps are used to create a vacuum around the penis, encouraging an erection by increasing blood flow into the penis. If already erect, a penis pump can make your erection harder and bigger. To help your penis slide past the soft jelly seal, use some water based sex lube. The sex lube will also help make a tighter vacuum seal possible on your Mojo Zero Gravity Penis Pump. Once you've created a vacuum, enjoy the feeling of your massive