Discover the efficiency and reliability of the Potter VSR-4 Waterflow Alarm Switch, designed for 4" nominal pipe sizes. Proudly assembled in the USA, this device features a customizable 0-90 second time delay retard, easily adjustable via a clearly marked knob. It includes two SPDT (form C) contacts and boasts a weatherproof build, ensuring durability in various conditions. The wire terminal designations are also clearly marked for straightforward installation. Upgrade your safety systems with this top-tier equipment. Act now to enhance your fire protection setup!