NINGBO DINGDANG IMP. & EXP. CO., LTD. NINGBO DINGDANG IMP. & EXP. CO., LTD. (ZHEJIANG AER BUILDING MATERIAL CO.,LTD.) is one manufacturer that specialized in the supply of outdoor chairs and sunlouge, gas and water, minerals use of polyethylene (PE) fused connection,butt,hot melt socket and PE ball valve and the same layer, siphon, ground source heat pump dedicated pipe fittings, PPR pipes and fittings, PP compression fittings, PVC/UPVC pipes and fittings.