About StockCap

The Leader in Product Protection

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 significant quantities allowing for lower prices
  • Plants are designed and optimised for cost-effective product protection manufacturing

Excellent Quality

  • The StockCap manufacturing facility located in Riverstone NSW is certified to the AS/NZS ISO 9001:2015 standard.


  • StockCap can serve your global needs through our manufacturing and distribution facilities in the U.S., Mexico, China, England, Germany and Australia.