Stylish Design: The Speedway Billet Aluminum Fuel Filler Neck with Pop-Up Gas Cap offers a sleek, flush-mount design that is perfect for the hot rodder seeking a sophisticated and minimalist look., Easy Installation: With a compact 2 1/2" diameter, this gas cap is easy to fit into tight spaces, and the 1-1/2" filler hose connection simplifies routing the hose to your fuel tank., Versatile Use: The gas cap can either be left popped up or pressed down until it clicks into a flush position, depending on your preference and convenience., Secure Design: The non-vented cap design ensures your fuel stays safe and secure, preventing leaks or splashes. It's recommended to use with a gas tank vent., High-Quality Construction: Made of polished billet aluminum, this pop-up flush mount gas cap not only.