Featuring unleaded bronze body with corrosion-resistant internal parts, 1 in. Models 100E VFD and 100ES VFD are designed to minimize flow losses and hydraulic shocks in pumping system. Both inlet and outlet threaded area allow for longer pipe threads, while guided poppet system (optional SS poppet) ensures that valves automatically adjust noiselessly from high to very low flow rates. Valves can be installed in either horizontal or vertical piping installations.