The Pacey Cuff, similar to a penis clamp, uses a urethral pressure pad (bottom) to apply pressure to the urethra and stop the flow of urine.>  The top of the Pacey Cuff ensures the circulation in the penis is not blocked (unlike with penile clamps which clamp both the urethra and the blood vessels in the penis).>  As the bladder fills, the pressure increases, resulting in possible leakage. The Pacey Cuff is most effective when you empty your bladder at regular intervals.