... face); RTJ(ring type joint); TG(tongue and groove face); MFF( male and female face)Products Details:We Tianjin Rongkun Pipe Fittings ... capabilities include Forging, Heat-Treating, Machining, Quality Assurance, And Quality Control, Our products meet a variety of industry standards ... including; ASTM, ASME, API, NACE, and MSS. Look forward to your continued business. TypeSocket Weld, ...