SO-FF-带颈平焊钢制管法兰

SO-FF-Flange

SO-RF-带颈平焊钢制管法兰

SO-RF-Slip-on-welding Flange

SO-MF-带颈平焊钢制管法兰

SO-MF-Slip-on-welding Flange

SO-TG-带颈平焊钢制管法兰

SO-TG-Slip-on-welding Flange