Series 700 Sight Flow Indicators are manufactured of quality materials and safety tested to assure long, dependable service at economical prices. The 700 Series offer threaded process connections, tube style viewing, and bodies of brass or 316 SS. Featured in the 700 is a bright red Acetal rotating impeller that is easy to view from any angle with the glass tube construction. Maintenance is simple with internal wipers, just rotate the glass tube and restore visibility without disrupting the flow.