Product Information Material: Aluminum Female Thread: NST (NH) Select a Product Part NumberFemale Thread SizeCoupler Size 2025-D-ALNST2-1/2"2" 3025-D-ALNST2-1/2"3" G150-D-ALNST1-1/2"1-1/2" G250-D-ALNST2-1/2"2-1/2"