Steel pipe flanges: Dimension to AWWA C-207; Type: Class D ( 175-150 psi); Size: 4" to 144"; Material to A105, A182 F304L/316L,etc. As a professional flanges manufacturer and a pipe fittings supplier for 17 years, we have two flanges forging factories located in Dingxiang,Shanxi,China.We have a strict quality control system.ISO 9001:2008 and PED certificate is available. All our products are highly accepted by the users from more than 40 countries .For further success, you may be happy to find a reliable factory with competitive prices & superior quality. Please send us your enquiry with your specific needs.