ARP Weld Bungs

2010–2025 Universal Fit for Oil, Fuel, Radiator, and More

Part #: 800-8215

Overview

The ARP Weld Bungs are premium-quality, CNC-machined weld-in fittings designed for a wide range of automotive applications. Whether you're customizing oil or fuel tanks, radiators, valve covers, manifolds, or rear axle housings, these bungs provide a reliable and durable solution for adding threaded ports to your vehicle's components. Crafted from high-grade materials, ARP weld bungs ensure a secure, leak-free connection that withstands the rigors of performance driving and demanding conditions.

Ideal for automotive enthusiasts, custom builders, and professional fabricators, these weld bungs allow you to create custom oil, fuel, or coolant lines with confidence. Their precise machining and quality materials help support your project’s durability and performance, making them a versatile choice for both street and race applications.

Key Features

ARP Weld Bungs are engineered with precision and durability in mind, offering several key benefits:

• Manufactured from CNC-machined 6061 solid aluminum billet or 1018 mild steel, providing strength and corrosion resistance.
• Available in your choice of sizes, including -12 AN thread size, suitable for high-performance fuel and oil systems.
• Designed for seamless integration into various components such as oil pans, radiators, valve covers, and housings.
• Precisely machined threads ensure a tight, leak-proof seal when welded into your custom or OEM parts.
• Manufactured by ARP, a trusted name in high-performance fasteners and hardware for automotive applications.
• Ideal for custom fabrication projects requiring reliable threaded ports for sensors, fittings, or lines.
• Easy to weld with standard TIG or MIG welding techniques, ensuring a clean and strong attachment.
• Available in steel or aluminum options to suit different thermal and weight requirements.

Construction & Design

These weld bungs are crafted from high-quality materials to ensure longevity and performance. The CNC-machined process guarantees precise dimensions and threads, which are critical for creating a secure fit and preventing leaks. The aluminum versions are lightweight and resistant to corrosion, making them suitable for applications where weight savings are important. Steel bungs provide added strength for high-pressure environments or heavy-duty use.

The design features a smooth, clean finish that facilitates easy welding and minimizes the risk of weld cracking or failure. The threaded portion is engineered to match standard -12 AN fittings, ensuring compatibility with a wide range of hoses, lines, and fittings used in performance and custom automotive builds.

Performance & Reliability

Designed for durability and precision, ARP weld bungs provide a reliable connection point for fuel, oil, or coolant lines. Their high-quality construction helps support the integrity of your system under high pressure and temperature conditions. Whether you're building a race car, a show vehicle, or a custom daily driver, these bungs help ensure your fluid systems remain sealed and functional over time.

Installation & Fitment

Installing ARP weld bungs is straightforward for experienced fabricators. Simply weld the bung into your chosen component using TIG or MIG welding techniques, ensuring proper heat control and penetration. No additional machining or modifications are typically required. Once welded, the threaded port can be used immediately for attaching fittings, sensors, or lines. These bungs are designed to fit standard -12 AN fittings, making them compatible with most performance fluid systems.

• No cutting, drilling, or special tuning is required beyond the welding process.
• Ensure proper welding techniques are used to maintain the integrity of your component and prevent leaks.

What's Included

• One ARP Weld Bung with -12 AN female thread
• Welding instructions (if applicable)

Ideal For

• Custom oil and fuel tank fabrication
• Radiator and coolant system modifications
• Valve cover and manifold fittings
• Rear axle and differential modifications
• Performance and race car builds requiring reliable welded fittings

Emissions Note

This product is intended for off-road, racing, or custom applications and may not be legal for use on pollution-controlled vehicles in all jurisdictions. Please verify local regulations before installation.