Swagelok SS-1210-6-4 316 stainless steel reducing union — 3/4 in. × 1/4 in. tube OD. Body in 316 stainless steel with the Swagelok two-ferrule (front-ferrule/back-ferrule) mechanical-grip tube end for a gaugeable, leak-tight connection on instrumentation and fluid-system tubing. The part provides a in-line tube-to-tube connection stepping 3/4 in. to 1/4 in. Supplied with Standard Cleaning and Packaging (SC-10). Working pressure and temperature ratings are determined by the selected tubing per Swagelok catalog MS-01-140; use with correspondingly sized, fully annealed 316/316L stainless steel tubing.