Product Information Material: Aluminum Male Thread: NST (NH) Select a Product Part NumberMale Thread SizeCoupler Size 3025-B-ALNST2-1/2"3" G250-B-ALNST2-1/2"2-1/2" G150-B-ALNST1-1/2"1-1/2" 2015-B-ALNST1-1/2"2"