Let the Precision Pump Standard provide the superior suction and ultimate comfort you need to maximize your erections. This pump encourages blood flow into your penis using a vacuum system, increasing both your length and girth over time to help you reach your full erection potential.The cylinder measures in at 8 inches by 2.25 inches, making it the perfect size to fit most cocks. A clear vacuum cylinder features universal incremental measurements to help you keep track of your progress during your regular pumping sessions. An easy squeeze pressure bulb makes amping up the suction a breeze; and, if you take it a little too far or want to wrap up for the day, a push button release valve will suck all the air out immediately.The American Pumping Association called the Precision Pump Standard 'the perfect pump for the first time or advanced pumpers.” The flanged base and removable, soft-ribbed donut keep you comfortable and wonderfully stimulated while you pump. A flexible, non-crimping hose makes enlarging your penis and increasing your pleasure potential a synch in any position. Your pump comes with a stretchy enhancer featuring easy grip handles, so you can switch seamlessly from pump to solo or partnered play without losing a bit of that awesome erection.