This invention is a device that utilizes hydro-block venting material in various condom catheter configurations to permit adequate airflow into the catheter thereby permitting efficient and complete drainage of urine away from the user following urination by means od gravity, siphoning or pumping. In one embodiment the condom that fits on the penis is itself made of hydro-block venting material. In another embodiment the hydro-block material is placed on the proximal end of a storage bag. In yet another embodiment a retro-fit assembly containing the hydro-block venting material can be retrofitted for use with any condom catheter. Both adhesive and inflatable rings are disclosed as attachment means to secure the condom catheter to the user and prevent leakage.