Tube To Male Elbow 3/4" Tube X 3/4" NPT ISSD12ME12 Duolok This 316 Stainless Steel Male Elbow 3/4" NPT ISSD12ME12 Duolok has a Tube O.D. of 3/4" and a NPT of 3/4" Duolok Vs. Swagelok ® Comparison Design   SSP Duolok tube fittings are designed...