StockCap is the foundation of the Sinclair & Rush family of companies . Starting with a small line of protective caps and plugs, the company has grown to become the largest manufacturer of flexible closures in the world. ......StockCap is the foundation of the Sinclair & Rush family of companies . Starting with a small line of protective caps and plugs, the company has grown to become the largest manufacturer of flexible closures in the world. In addition to the large selection of stock products, we offer experienced engineers who are available to develop customised solutions for your product protection needs. What makes StockCap a leader in product protection Unmatched Selection More styles and sizes More standard colours and materials Ability to mould flexible rubber products In-house finishing department offering a variety of options Low Cost As a plastisol compounder, material is bought in full truck and tanker quantities allowing for lower prices Plants are designed and optimised for cost-effective product protection manufacturing Excellent Quality March 2001, the Arnold Manufacturing Facility of StockCap ACG was certified as a TS-16949/ISO 9001/ISO 14001 Quality Supplier. Global StockCap can serve your global needs through our manufacturing and distribution facilities in the U.S., Mexico, China, England, Germany, and Australia.