A syringe sold by syringe manufacturers is a simple piston pump consisting of a plunger that fits tightly in a tube. The plunger can be pulled and pushed along inside a cylindrical tube (the barrel), allowing the syringe to take in and expel a liquid or gas through an orifice  at the open end of the tube. The open end of the syringe may be fitted with a hypodermic needle, a nozzle, or tubing  to help direct the flow into and out of the barrel. Syringes are often used to administer injections, apply compounds such as glue or lubricant, and measure liquids. ELITE MEDICAL (NANJING) CO.,LTD is one of the syringe manufacturers.