Opto-Matic® Oilers provide an inexpensive method to automatically maintain a constant level of oil in a pump bearing housing, gear box, or other oil sump applications. Throughout processing industries, the Opto-Matic Oiler is the industry standard. Different reservoir capacities allow use in many applications. Opto-Matic® Constant Level Oiler, Standard, Glass Bowl, 8 oz, 1/4 in NPT, 3-3/16 in Dia, 6-11/16 in Height, 250 °F Operating, Zinc Plated Components