We are Henan dongfanglong machine manufacture based in Puyang, China. We are member of TradeKey.com since July, 2014. Our business is related to Industrial Machinery industry and we specifically deal in API couplings and pup joints. Please find our product details below: API tubing/casing couplings 1:type: 2 7/8"tubing couplings 2:grade:K55 J55 L80 N80 3:thread:eue/nu 4:packing:wooden box, pallet, case, carton, as your inquiry Our company have more than 14years experience of producing, deve... API 5CT 5 1/2" BTC couplings 1:type: 51/2"casing couplings 2:grade:K55 J55 L80 N80 P110 3:thread:BTC 4:packing:wooden box, case, carton, pallet, as your inquiry Our company have more than 14years experience of producing... Thank you for taking time to go through our business profile. If there are any questions, inquiries or comments, please feel free to contact us.