303 Stainless Steel is recommended for GC use and general-purpose connections, combining excellent machining characteristics with good resistance to corrosion and high-temperature oxidation. Susceptible to attack by chlorides, iodides, and bromides.
Valco zero volume ferrules may be used with all Valco fittings and with those of most other manufacturers. Valco metal ferrules cut a ring near the end of the tube, preventing tube release at high pressures without significantly deforming and restricting the tube interior. (However, if the hardness of the tubing is equal to or greater than that of the ferrule, deformation of the tube rather than a cut ring is likely.)
