... "-32" 5. Types:SO,WN,PL,BL,SW PN2.5Mpa Carbon steel welding neck raised face flange (mm) 1. Types:a ... .25Mpa-PN2.5Mpa 5. Standard:a) ISO9000-2008b) Customers' drawings for special use 6. Types we can supply: WN, SO, BL ... ' requirement 10. Different accessories are available Our factory : PN2.5Mpa Carbon steel welding neck raised face flange