The RĂ¼sch MMG Intermittent Catheter Closed System is clinically-proven to reduce urinary tract infections. For more than two decades, this product has helped to protect individuals from recurrent UTIs. Simply remove the protective cap, load the pre-lubricated catheter into the Guardian Tip Introducer, insert introducer into the urethra and pass catheter into the bladder. The collection bag holds 1500 mL .