... ,large size elbow,reducer,weldolet,coupling,steel pipe cap,seal head,end cap,concentric reducer,eccentric reducer,steel pipe,pipe fitting ... pipe and fittings,like 45deg,90deg,180deg,L/R OR S/R,bend ,equal or reducing tee, CON reducer, ECC reducer ... under the ISO 9001:2000 strictly. carbon steel elbow 73*6