Our Tube Fittings, Twin-Ferrule include male connector, female connector, equal union, reducing union, bulkhead union, bulkhead male connector, male elbow, female elbow, union elbow, union tee, union cross, male branch tee, male run tee, female branch tee, female run tee, front ferrule, back ferrule, nut, plug, cap, socket welding pipe connector, butt welding pipe connector, reducer, an union connector, male tube adapter and female tube adapter, which have the same chemical, heating, and hardening treatments as Parker and Swagelok Fittings do. About working pressure of our tube fittings, it’s 6000psi for twin-ferrule type in Stainless Steel, 300psi for single-ferrule type in Brass material, and 1000psi for twin-ferrule type in Brass material. Our available sizes include metric sizes 2mm ~ 25mm and fractional sizes 1/16” ~ 1”. We can produce other sizes upon request.