Series 400 Sight Flow Indicators are manufactured of quality materials and safety tested to assure long, dependable service at economical prices. The 400 Series offer threaded or ANSI flanged process connections, tube style viewing, and bodies of cast iron or 316 SS. Featured in the 400 is glass tube construction offering easy flow viewing from any angle. Sight flow indicator 4 body 5.750 (146 mm) length 9.000 (229 mm) flange dia. 5.000 (127 mm) viewing dia.