6L-WU1-TB8-TB6
316L Stainless Steel, FITOK M Series Micro Butt Weld Fitting, Reducing Union, 1/2 in. × 3/8 in. O.D.
6L-WL1-TB8-TB6-F3
316L Stainless Steel, FITOK M Series Micro Butt Weld Fitting, Reducing 90° Union Elbow, 1/2 in. × 3/8 in. O.D., FITOK FC-03 Ultra-High Purity Process Specification