line pipe coupling NameTypeCoupling thread typeCoupling thread type SpecificationCoupling thread typeSteel grade Line Pipe Couplings2” LP L175orA25L210orAL245GoodsB8” LP L175orA25L210orAL245GoodsB2-1/2”10”3”12”3-1/2”14D”4”16D”5”18D”6”20D”