Suction Hose Coupling Material:Aluminum, Brass,Polypropylene Size:1-1/2",2",2-1/2",3",4",6" Suction Hose Coupling Nominal size AluminumBrassPolypropylene 1-1/2" HX/Pinlug-1.5HX/Pinlug-1.5HX/Pinlug-1.5 2" HX/Pinlug-2HX/Pinlug-2HX/Pinlug-2 2-1/2" HX/Pinlug-2.5HX/Pinlug-2.5N/A 3" HX/Pinlug-3N/AHX/Pinlug-3 4" HX/Pinlug-4N/AN/A 6" HX/Pinlug-6N/AN/A