Image Air Brake Union Elbow Markets Transportation Jump to Section Product Options Related Products Product Options Part Number Tube Size Thread Thread Size Material 65NAB4 1/4" Straight 7/16"-24 Brass 65NAB6 3/8" Straight 17/32"-24 Brass 65NAB8 1/2" Straight 11/16"-20 Brass 65NAB10 5/8" Straight 13/16"-18 Brass Related Products Image Air Brake Female Connector Image Air Brake Insert Image Air Brake Male Connector Image Air Brake Male Elbow Image Air Brake Nut Image Air Brake Union Image D.O.T. Air Brake Tubing