???? ????? ???? ?????? ?? NPT ????? ?????

????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ?????? ?????? ??????? ???? ?????? ?? NPT. ?? ????? ??? ???????? ???????? ?????? ????????? ???????? ?????? ????????? ????????? ?????? ?????? ??????? ????? ??? ?????? ?? NPT ???? ????? ?????? ???? ??? ?? ????? ????????? ??? ???? ????? ??????? ?? ??? ?? ????? ????? ?????? ?????? ??????? ???????. ???? ????? NPT (National Pipe Thread) ??????? ????? ??????? ??????? ??? ????? ??????? ??????? ????? ?? ????? ????????? ?????? ??? ???????? ?? ?????? ?????? ?? ??????? ??? ?? ??? ??????? ???????? ???????? ??????? ????? ?????? ???????? ????? ??????? ??????? ???????. ?? ????? ?? ???? ???? ?????? ????? ???? ?????? ???? ??? ????? ?? ????? ?????? ???? ???? ??? ???????? ??????? ???? ???????? ????? ?? ??? ?? ?? ?????? ?????? ?? NPT ??? ???? ??????? ?????????. ???? ??? ????? ?????? ?????? ??? ????? ????? ???? Shijiazhuang Deye Piping Industries Co., Ltd. ????????? ???????? ???????? ?????? ??