???? NPT: ?????? ??????? ?????? ???????? ???? NPT

???? Npt? ??????? ????? ???? National Pipe Thread? ?? ??? ?? ????????? ???????? ????????? ?? ????? ????????. ??? ?? ?????? ?????? ????? ???? ???? ??? ??????? ?? ???????? ?? Shijiazhuang Deye Piping Idndustrys Co.,Ltd.? ???? ?????? ????? ?? ?????? Npt Switch ?????? ???????? ???????? ????????. ????? Npt ?????? ??? ?????? ?? ???? ????? ?????? ??? ??????? ??????? ????? ???????? ???????? ???????? ??? ???? ??????? ?????????? ?? ????????? ????????? ????? Npt ?????? ??? ?????? ?????? ?????? ?????? ?? ??????? ??? ???? ?????? ??????? ???????? ?? ???????? ????????. ?????. ??? ?? ??????? ????? ????? ?????? ????? ???????? ??? ?????? ?????? ????????? ?? ??????? ?????? ??? ???????? ?????????? ?????? ?????? ?????? ??????? ??? ???????? ??????? ???? ???????? ??? Shijiazhuang Deye Piping Idndustrys Co.,Ltd. ?? ?????? ?????? ????? Npt ??????. ???? ??? ????? ?????? ?????? ??? ?????? Npt Switch ?????? ??? ???? ???? ?? ???? ???????