auto muffler Mainly used in more bad environments, it would be better for reduce the noise. big flux. XY Type Series Aluminous auto MufflerMaterial:BronzeItem Code:XY-05,XY-07,XY-10,XY-12,XY-15,XY-20Thread Size:1/2",3/4",1",11/4",11/2",2" Thread Kind:NPTColor: NatureNormal Package: Plastic Bag. XY Type Series Aluminous quto Muffler