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??? ?????? ?????? ?????? ?????? DIN PN16 ?????? ???? ??????? ?? ??? ???? Shijiazhuang Deye Piping Industries Co., Ltd.. ?? ????? ??? ???????? ????? ?????? ????????? ????????? ??? ???? ????? ??????? ?????? ????? ?????? ????? ?????? ?????? DIN PN16 ?????? ??? ?????? ???? ?? ??????? ??????? ????? ????? ??? ???? ???? ???? ?????? ????? ??????. ?? ????? ???????? ????? ????? ?????? ????? ???????? ??? ?????? ?????? ??????? ????? ?? ??????? ????????. ?? ????? ???????? ?????? ??????? ????????? ?? ????? ???? ????? ???? ???? ??????? ????? ????? ?????? ?? ??? ?????? ?? ?????. ??? ?????? ????? ?? ?????? ?????? ?? ??????? ?????? ?????????? ??????? ????????? ????????? ?? Shijiazhuang Deye Piping Industries Co., Ltd.? ??? ??????? ?????? ?????? ????? ?????? ????? ????? ??????. ????? ?????? ?????? DIN PN16 ?????? ??? ?????? ????? ??? ??? ????????? ??? ???? ????? ?????????? ???????? ????????? ????????. ???? ??? ????? ?????? ?????? ?? ?????? ?????? ????? ???? ???? ?? ???? ???????