Billet Aluminum Construction – CNC-machined from a single solid aluminum billet for superior strength that won’t crack under pressure. Prevents Air Ingress & Fuel Leaks – Eliminates the risk of air entering the fuel system and stops dangerous fuel leaks for reliable starts and safe operation. Direct OE Replacement – Installs in seconds on factory filter housings using the included O-ring for a perfect, leak-proof seal. Heat & Chemical Resistant – Durable aluminum withstands high under-hood temperatures and exposure to diesel and additives far better than plastic caps. Quick, Maintenance-Free Upgrade – Simple bolt-on swap using basic hand tools delivers immediate, long-lasting performance.