Changyi Changrong Machinery Co., Ltd., a subsidiary of Chang Ning Group, is a private owned manufacturing company. The factory is located in Chang Yi City which is the foundry of Chinese casting. Changyi Changrong have 400 staffs, 50 professional technical personnel among them and occupy 19000 square meters. Changyi Changrong specialize in polymer concrete channel� kinds of grates�drainage part and cast iron valve. It prides itself on varies specifications and reliable quality. OEM is accepted. Trough continues scientific investment and new products development, Changrong�s products are sold in the market of USA, Japan, Canada, Germany, Denmark, Italia, Belgium, Finland, Holland, Australia , Taiwan and other countries and areas. Changyi Changrong Machinery Co., Ltd., have passed the ISO9001 : 2000 quality system attestation in 2001. �CHANGRONG DRAIN�Polymer Iconcrete channel are approved by Spanish APPLUS+EN1433 Test and get the EN1433 certification which number is 10SH200010013. Insist on the principle of Science first, quality principal, credit uppermost, the company welcome friends at home and abroad for cooperation and mutual benefit.