... quality,low price 2. OEM service 3. Delivery in time Tee of Grooved couplings and fittings1) Material: Ductile iron ASTM A536 ... Ltd" 's Casting Processing Department. is specialized in manufacturing of ductile iron grooved fittings,Grooved couplings,couplings, castings, pipe ... fittings. If you are interested in any of our products, please contact us with you detailed requirements and ...