Ua hoʻokumu ʻia ʻo Donsen ma 1996, aia ma NINGBO kahi i kūkulu ʻia a nani hoʻi ke kūlanakauhale awa honua. Loaʻa ma mua o 10 mau makahiki o ka ʻike ma kēia kahua, ʻo mākou kekahi o nā mea hana ʻoihana loea i ka hana ʻana i ka pipeline plastic no ka lako wai a me ka ʻōnaehana irrigation.

ʻO kā mākou huahana nui nā paipu PP-R a me nā mea hoʻopili, nā mea hoʻopili PP, nā paipu C-PVC a me nā mea pono, nā paipu U-PVC a me nā mea pono, nā paipu hoʻomehana honua PE-RT, nā'ōmole'ilika a me nāʻano pahū pahū. No nā laʻana: PVC valve , PPR valve, C-PVC valve, BRASS valve.