SFI-400F-1-1/2 is a series 400 midwest sight flow indicator manufactured of quality materials and safety tested to assure long, dependable service at economical prices. Series 400 offers threaded or ANSI flanged process connections, tube style viewing, and bodies of cast iron or 316 SS. Viewing style in the SFI-400 series with connection choices of female NPT, BSPP or BSPT threaded and flanged. Typical applications include hydraulic tanks, pressure vessels, coolant tanks, hydraulic lines, oil reservoirs.