Curtiss-Wright EST Group specializes in the design and manufacture of highly-engineered tube plugging products and repair services for shell and tube heat exchangers, condensers, coolers and chillers. Our flagship product, Pop-A-Plug® Heat Exchanger Tube Plugs, are the industry’s leading technology for plugging leaking and degraded heat exchanger tubes. EST Group also engineers and manufactures GripTight® test and isolation plugs to greatly simplify and expedite pressure testing and/or isolation of piping, tubing, valves, pressure vessels and a multitude of special applications