Overflow coolant tank caps are designed to fit coolant tanks with a threaded fill neck.Complete replacement caps are machined from billet aluminum, with a polished surface comes with pressure cap.A clear anodized finish adds shine and durability.Scalloped design, making them the perfect complement to any engine bay.Coolant reservoir cap is a great way to give your engine a custom look.Part Type: Coolant Reservoir Caps.Cap Finish: AnodizedCap Size: 2 inch/51 mmMaterial:Aluminum alloycolour:blackPackage Contents:2 x vented gas capOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.