JACOBUS® vents feature the most reliable dual regulation construction available. Now PLATED VALVE SEAT BI-METAL THERMOSTATIC SOLID FLOAT ELEMENT JACOBUS® ‘Steam Valves’ are recognized as THE industry leading steam valves available today. The operating mechanism including the thermostatic element, valve seat, and float are proven to give superior venting performance. The installation of these steam valves will provide a more efficient and better looking heating system.