... 1. oil drilling equipment parts 2. including Casing head tubing spool gate valve flange 3. base on API 6A standard Oil ... drilling equipment parts including casing head tubing head gate valve flange All parts manufature according to API 6A ... casing spools, tubing heads/spools, tubing head adapters, casing hangers, tubing hangers, base plates, secondary seals, FC type slab gate valves, M ...