Mojo Zero Gravity Penis Pump Black. Penis 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 erection. After 10 minutes it is advisable to reduce pressure by pressing the release button attached to Max Results Pump chamber. You can re-pump your erection, just avoid having it at full pressure for more than 10 minutes at a time. Clean-up is easy. Just wash the Mojo Zero Gravity Penis Pump's tube out with soapy warm water. Pat it dry with a soft towel. You can also use any one of our toy cleaners for that like-new look.This easy-to-use versatile enhancement penis pump comes with an oversized cylinder and universal measurements. Gain size and confidence! Put some Water-based lube on the rubber seal for a perfect vacuum and watch it GROW.Mojo Zero Gravity Penis Pump Specifications: Flanged base for secure seal with or without the removable Silicone donut Pliable Silicone hose and suction bulb Quick release push button purge valve Silicone (bulb, donut, hose) ABS (cylinder, purge valve) 8.5 inches x 2.5 inches / 21.5 cm x 6.25 cm (cylinder) See-thru acrylic chamber.