... Square Flange, Lwnrf (Ff), Thrf (Ff) Facing Method: rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or colored ... PED and AD-2000 certification. Inspection: Factory In-House Or Third Party Shape: Equal Usage: connecting pipe line and keep its ... of pipe line; easy to seal pipe line, such as oil, petroleum, gas, chemical industry, nuclear power station, water and ...