The F-40377GN-6 Blue White Flow Meter is made from durable acrylic meter body, polished to a clear finish. Direct reading permanent scale. White back reflector for easy reading. Viton o-ring seals. (Optional K-series hastelloy C-276). Standard models #316 stainless steel, PVDF, Teflon float. (Optional K-series hastelloy C-276, PVDF, Teflon). Acceptable in direct sunlight applications. Available OEM options: Private labeling, custom calibrations, custom materials. Guaranteed to get the job done and then some. MTR2 1-12 SCFM ACY .37 FPT