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Fit: 2" inner‑diameter weld‑on filler neck and cap custom oil, fuel, water or coolant tanks on most cars. Billet Aluminum: CNC‑machined aluminum alloy resists corrosion, pressure, vibration and extreme under‑hood heat for long life. Easy Welding: Thick base flange offers ample material for TIG or MIG welding to steel, aluminum or stainless tanks with secure hold. Leak‑Free Seal: Supplied O‑ring plus precision threads create a tight seal, stopping fluid loss and keeping contaminants out. Quick Access: Deep knurled cap edge provides a sure grip for fast removal during refills or checks, even when wearing gloves.