Expansion Tank Cap - Black Anodized

This billet aluminum coolant cap from JCaps is a precision machined aluminum cover that snugly fits over the factory cap. This cap is designed to fit the late style caps that have the “slotted” design.

To install, evenly press the billet cover over the factory cap. Do not attempt to install the cap when the engine is warm. Since the cap is machined within a few thousandths of an inch of the factory part and when the factory cap is hot, it will expand to the point of being to big for the aluminum cap to fit over. Once the cap has been properly installed, there are two stainless steel set screws that secure the cap in place.

JCaps started back when Jay, a mechanical engineer, became the proud owner of a brand new 2004 R32. He sought after high quality, billet machined accessories to dress up the engine bay and interior, but nothing on the market met his high quality standards. The only option was for him to engineer and produce his own precision machined components. The response on the forums was so overwhelming that he began selling them to other enthusiasts, who also shared his attention to quality and detail. All JCaps products are precision machined from 6061 series billet aluminum and include stainless steel hardware, where needed. ECS Tuning is proud to be the exclusive distributor of JCaps by providing the entire catalog in one, convenient online store.