... (Blff), Swrf (Swff), Plrf (Plff), Ljrf (Ljff), Spectacle Flg8 (Spacer & Blanks), Square Flange, Lwnrf (Ff), Thrf (Ff) Facing Method: rust preventing ... Plate Flange, Companion Flange, Plate (PL) Flange, Spectacle FLG8 (Spacer & Blanks), Square Flange, Long Welding Neck (LWN) and so on. Standards ...