This classic syringe is a collectors item. Made of high quality polished metal (chrome-plated brass). Operation is as follows: 1) Pull back the plunger. 2) Unscrew the cap and fill with liquid. 3)Insert into the rectum and push plunger, liquid fills into the person. Tip can unscrew for easy cleaning. This syringe can also be used for injecting fluids into inflatable portion of urinary catheters. A bulbous tip and a catheter tip with a splash shield are now included. Larger size for more capacity. Now standard is whopping 8oz capacity.