Ohio-based Brennan Industries Inc. has introduced a line of double ferrule instrumentation-grade tube fittings that are interchangeable, intermixable and are traceably stamped. Brennan’s double-ferrule, instrumentation-grade fittings feature interchangeable nut and ferrule sets, which enables the installer to use one tube fitting manufacturer’s nut and ferrule sets within the body of another manufacturer. The tube fitting line also has intermixable components that work with those of several other manufacturers. The design characteristics are comparable in form, function and fit allowing for intermixability between the designs. All components of the tube fittings are Brennan stamped and all packaging has traceable codes printed on the box for reference. Each fitting is packaged in its own pouch and thread-protector to keep the fitting clean from contaminants. Brennan products are available in carbon steel, stainless steel and brass.