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Overflow coolant tank caps are designed to fit OEM coolant tanks with a threaded fill neck.
Complete replacement caps are machined from billet aluminum, with a polished surface comes with pressure cap.
Scalloped design, making them the perfect complement to any engine bay. A clear anodized finish adds shine and durability.
Coolant reservoir cap is a great way to give your engine a custom look.
Cap OD Size: 1.5" /38mm, 2"/50mm, 2.3"/58.5mm,3"/76.2mm,4"/101.6mm.(Please buy according to your needs and the size in the picture).