... ,air or anyother materials . C Type Exhaust muffler 1.Material:BronzeItem Code:C-6,C-8,C-10,C-15,C-20,C-25Thread Size:1/8 ... ",1/4",3/8",1/2",3/4",1"Thread Kind ... on.by the way, our product has three kinds of thread including BSPP(G) ,NPT and BSPT. or if you want ...