AM Type Aluminous auto Muffler,Mainly used in more bad environments, it would be better for big flow rates . AM Type Series Aluminous auto MufflerMaterial:AluminousItem Code:AM-6,AM-8,AM-10,AM-15,AM-20Thread Size:1/8",1/4",3/8",1/2",3/4"Thread Kind:NPTColor:NatureNormal Package: Plastic Bag AM Type Series Aluminous Muffler