FITOK 6D Series double ferrule compression fittings, designed specifically for instrumentation, are made from 316L stainless steel, with a Ni content of 12-14 %, Cr of 17-18 % and C of 0.04-0.065 %. This composition provides excellent corrosion resistance, high temperature resistance and high mechanical strength. The double ferrule ensures even distribution of the gripping force and a reliable seal, guaranteeing leak tightness in hydrogen, specialty gas and high and ultra high purity systems.