Blue-White Industries F-451N Inline Flow Meter

Blue-White Industries’ F-451N Inline Flow Meter is a compact, in-line rotameter that provides quick, local flow indication in process lines. It reads 1–10 GPM (4–40 LPM) with a 1.0" FNPT inline connection, enabling straightforward mounting on small-diameter piping. The meter uses a molded polysulfone body and a stainless steel (316 SS) float, delivering reliable flow indication across a range typical for water-like liquids. A dual-scale readout in both GPM and LPM is printed on the face for fast cross-checking of the current flow rate. Variants in the F-451N family include 1.0" FNPT inline configurations with EP O-rings and other sizing options such as 1.5" inline or elbow fittings. This inline meter is appropriate for general-purpose water service, cooling lines, and equipment washdowns where simple, local monitoring of flow is required. The manufacturer notes that flow meters are specified for water, and compatibility with other liquids should be verified to ensure accurate readings and avoid damage when used outside the intended liquids.