Cast body sight flow indicators have a heavy duty cast construction to handle pressure and temperature requirements. A glass window on either side provides product visibility. Mechanical indicators help to enhance the visibility of the media include flappers, rotors and drip tubes. The cast body and threaded or flanged connections meet ANSI standards. Standard materials of construction are carbon steel, ductile iron and bronze. The radial sealing method and the bolt on body design provides years of service with no torquing maintenance required.