Feature: *Overflow coolant tank cap are designed to fit OEM coolant tanks with a threaded fill neck. *Complete replacement cap are machined from billet aluminum, with a polished surface comes with preure cap. *A clear anodized finish adds shine and durability. *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. Specifications: *Material: Aluminum alloy *ID Size: As Show *Cap Color: Black anodized *Size: 1 inch/2 inch/2.5 inch *Neck Color: Pure Natural for perfecr welding performance Package included 1 xFiller Neck Cap Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightne of your monitor and light brightne. 2. Please allow slight manual measurement deviation for the data.