Overview Reviews Product Description Tube Union Ell connects 3/32" O.D. copper or brass tube to a male 3/16-40 UST model pipe thread at a 90 angle. Uses TUN3 union nut. Product Videos Product Reviews Write a Review Write a Review × Tube Union Ell Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *