Since 1978 Flow Design has been a leader in the hydronic balancing industry. Throughout its history, Flow Design has established a reputation for outstanding quality and has continually developed new products to offer superior performance benefits. They hold several patents including: Multiflow flow regulating valves, SuperVent combination air vent/probe port, Flow Shaper enhanced venture product, AutoCheck autoflow with protection feature, AutoFlow in various configurations and SuperSeal valve test plug.