Qingdao Wenrun Holding Co., Ltd. dị na Qingdao China bụ ọkachamara n'elu ụlọ na ọdọ mmiri na-emepụta na ndị na-ebubata ya.Anyị na-elekwasị anya na mmepụta na ahịa nke PVC TPO na EPDM akpụkpọ anụ maka ụlọ ụlọ, EPDM liner maka ọdọ mmiri usoro.N'otu oge ahụ anyị na-enye otu nkwụsị ọrụ nke ngwa ndị metụtara ya (tepu seam, teepu mkpuchi, teepu nrụzi, akuku prefabricated, drainage, scupper, fastener, plates, termination bar, U bar, welding machines, installing tools etc) na-egbuke egbuke maka otu. Sistemụ elu ụlọ ply, sistemu elu ụlọ akwụkwọ ndụ akwụkwọ ndụ, sistemu elu ụlọ fotovoltaic na sistemụ mgbochi-seepage ọdọ mmiri.