zs-oilfieldequip Restructured from SINOPEC in 1997, Puyang Zhongshi Group Co., Ltd has 20 years manufacturing experience of casing cementing products till now, designes and manufactures casing equipment like bow spring centralizer, solid rigid centralizer,float equipment, cementing plug etc,aslo focuses on casing cementing solutions For more info visit us on : http://www.zs-oilfieldequip.com/