FITOK single ferrule compression tube fittings are manufactured from high quality 316 stainless steel offering enhanced mechanical strength and corrosion resistance. They are precision engineered to provide leak-tight and vibration-resistant connections for instrumentation, process and control systems where quality tube fittings are required. The fitting is comprised of three parts: body, nut and ferrule, which is a safe design in the sense that it is almost impossible to assemble in the wrong way, thus reducing chances for error or leaks. FITOK offers both double ferrule and single ferrule tube fittings. While double ferrule tube fittings are more popular, single ferrule tube fittings have many features that make them a good choice in the industry. FITOK single ferrule tube fittings are interchangeable with Parker CPI series products.