Duolok ISSD12UT Union Tee, 3/4'' Tube, 316SS 3/4 Tube x 3/4 Tube Fitting Duolok ISSD12UT Features: T Tube O.D. - 3/4" A- 3.14" Ax- 1.57" B- 2.34" Bx- 1.17" C- .86" D- .96" E Min Opening- .62" G- 1-1/8" H- 11/16" Duolok Vs. Swagelok ® Comparison ...