With its special no-crimp air hose, realistic air-tight seal and super-accurate pressure gauge, Adam’s ProMax Pump is the helping hand an erection needs! Vacuum suction pulls blood into the shaft to improve an erection. Realistic silicone ring provides a super-tight seal. Special no-crimp hose extra-large plastic chamber make it easy to use. Chart your progress with the heavy-duty gauge or built-in ruler. Measures 2.25 inches wide and 9.25 inches long. Recommended by doctors for men with erection problems.