If you're dealing with precise chemical dosing in industrial or water treatment applications, this LMI B121-392SI metering pump is exactly what you need! This workhorse delivers 2.5 gallons per hour at up to 100 PSI pressure, making it perfect for everything from water treatment plants to manufacturing processes. The PVDF construction is the real star here - this stuff is seriously corrosion-resistant, so it can handle all kinds of aggressive chemicals without breaking down. You get manual dual control for precise adjustment, ceramic valve balls that stand up to wear and tear, and a fluorofilm diaphragm that just keeps going. The 4-function valve gives you plenty of flexibility for different installation setups, and it works with standard 0.375-inch OD polyethylene tubing. Whether you're adding chlorine to water systems, chemicals to industrial processes, or any other precise dosing application, this pump delivers reliable performance day after day. It runs on standard 115V power at 50/60 Hz, so installation is straightforward. The PVDF/polyprel seats and O-rings mean you won't be dealing with constant maintenance or replacements. This isn't some cheap import - LMI has been making quality metering pumps for decades, and this B121 series represents their proven technology at a reasonable price point. If you need dependable chemical dosing that you can set and forget, this pump won't let you down!