These Jacoby-Tarbox 830-F Sight Flow Indicators with Drop-In Spray Rings are making their way to a Bio-Diesel plant in the Southwest U.S.! These indicators are playing a crucial role in refining animal fat (cooking oil) into Bio-Diesel by providing operators with clear, 360º visibility of the process. How it Works: Before the feedstock passes through the sight glass, gums are separated in a centrifuge at 150-185°F. These gums can range from fluid to highly viscous, dependin