Application: For custom tanks, splash bowls, bottles etc Fuel Oil Tank /Fuel Surge Tank ,Water Tank , Radiator, Coolant ,Cooler. For use with fuel systems & any other applications. Specifics 100% Brand New. Aluminium screw filler cap neck for fitting to a hose. It can also be welded to a tank. The cap has a knurled outer edge for grip when unscrewing and is supplied with a sealing ring. 6061 Billet Aluminum Bung And Caps are great for just about any project. Including rear end differential housings Fill Caps, Valve Cover Fill Caps, Surge Tank Fill Caps, Coolant Overflow Catch Cans; And Just About Anything You Can Think Of. They Are Not Vented And Come In 5 Different Sizes, See Related Products in our store. Part Type: Coolant Reservoir Caps. Type: * Screw On Cap * Includes Sealing Ring Cap Material: 6061-T6 Aluminum alloy Cap Finish: Black /Silver same as the picture. Note : For the size please check with the picture, and for the size 1 ,2 ,2.5 that s refer the tank s hole size . Professional Installer is Highly Recommended (No Instruction Included).We are manufacture, if you want other size , please contact