Eaton’s next-generation sodium-filled hollow-head valves are currently being evaluated by several global automakers, with start of production scheduled for 2023. Learn more about Eaton’s valves .

Federal-Mogul Powertrain's Hollow Stem Valve Technology Meets the Challenges of Higher Engine Temperatures and Increased Peak Cylinder Pressures. GlobeNewswire . Thu, Jul 23, 2015, 10:31 AM.

The valve system created by Boston-based company Opti, essentially turns Panther Hollow Lake into a natural holding tank for stormwater, increasing its water volume capacity by about 70 percent.