Product Information Seal: Buna-N Female Thread: NST (NH) Select a Product Part NumberMaterialFemale Thread SizeAdapter Size AHA2525ADPAluminum2-1/2"2-1/2" AHA1515ADPAluminum1-1/2"1-1/2" HA2525ADPBrass2-1/2"2-1/2" HA1515ADPBrass1-1/2"1-1/2"