Cole-Parmer’s bottletop dispenser offers great performance over long period of time. Spring-less technology enables customer to use both organic and inorganic reagents. Jam-free piston not only helps for free piston movement but also ensures service-free operation. For flexibility of work the adapter is designed to rotate 360° which are available in various sizes - 28mm, 32mm, 36mm, 40mm and 45mm. The PTFE piston with ETP O-ring provide frictionless movement reducing the occurrence of bubbles in your dispenses. Models with recirculation valve help in saving costly regeants by directing the liquid into the bottle for bubble-free dispensing.