Clean up unused ports Cap unused ports when needed with a secure seal, tool key installation and mirror like cover cap for a professional look. Chrome Plated Mirror Finish Dipped in Chrome inside and out to prevent corrosion internally when in contact with the coolant offering a mirror like finish. Industry Standard Compatibility Offering industry standard G 1/4 threading for mounting to all compatible components with O-ring for a proper seal. Easy to Install and Remove Slotted base allows easy use of installation or removal with top cap to cover up.