---Malleable iron fittings: Size of 1/4"-6", Standard of ANSI/ASME,DIN,BS,Etc.
---Seamless Butt-welding fittings: Size of 1/2"-48",Standard of ANSI/ASME,DIN,BS,
　　　　　　　　　　　　　　　　　　　 JIS,MSS,Etc.
---Stainless steel fittings: Size of 1/4"-4", Standard of ANSI/ASME,DIN,BS,Etc.