ARP Weld Bungs

2000–2025 Subaru WRX / Subaru STI 2.0L Turbo

Part #: 800-8211

Overview

The ARP Weld Bungs (800-8211) are premium-quality, CNC-machined weld-in fittings designed for automotive enthusiasts and professionals who need reliable, durable bungs for custom fabrication projects. Whether you're building or modifying oil or fuel tanks, radiators, valve covers, manifolds, or rear axle housings, these weld bungs provide a precise and secure connection point. Crafted from high-quality materials, these bungs ensure longevity and consistent performance under demanding conditions.

If you're working on a custom turbocharged build, fuel system upgrade, or any project requiring custom weld-in fittings, ARP's weld bungs are an excellent choice. They are engineered to withstand high pressures and temperatures, making them suitable for both street and racing applications. With ARP's reputation for quality and precision, you can trust these weld bungs to deliver a secure, leak-free connection for your custom fabrication needs.

Key Features

ARP Weld Bungs are designed with the professional fabricator in mind, offering a combination of durability, precision, and versatility. Here are some of the key features that make these weld bungs stand out:

• Manufactured from CNC-machined 6061 solid aluminum billet or 1018 mild steel, ensuring high strength and corrosion resistance.
• Precisely machined with tight tolerances for a perfect fit and easy installation.
• Thread Size: -20 AN, compatible with a wide range of AN fittings and hoses for fuel, oil, or coolant systems.
• Available in steel or aluminum options to suit your specific application and material preferences.
• Ideal for custom oil or fuel tanks, radiators, valve covers, manifolds, and rear axle housings.
• Designed to withstand high pressures and temperatures, ensuring long-lasting performance in demanding environments.
• Easy to weld in with standard welding techniques, providing a secure and leak-proof seal.
• Perfect for race cars, street builds, or any custom fabrication requiring reliable weld-in fittings.

Construction & Design

The ARP Weld Bungs are crafted with precision from high-quality materials to ensure durability and reliability. The CNC-machined 6061 aluminum billet offers a lightweight yet strong option, resistant to corrosion and suitable for high-performance applications. The steel variants provide added strength for more demanding environments or higher pressure systems. Each bung features a clean, professional finish with precise threading to ensure a secure connection with AN fittings.

The design incorporates a smooth, CNC-machined surface that facilitates easy welding and minimizes the risk of leaks. The threaded portion is engineered to meet the -20 AN standard, making it compatible with a wide range of AN fittings used in fuel, oil, and coolant systems. These bungs are ideal for custom fabrication projects where precision and quality are paramount.

Performance & Reliability

While these weld bungs are primarily designed for fabrication and custom applications, their high-quality construction ensures they perform reliably under high-pressure conditions typical of fuel and oil systems. They provide a secure, leak-free connection that maintains integrity even under extreme temperatures and pressures. Whether you're building a race car or a custom street vehicle, these bungs help support a safe and efficient system.

Installation & Fitment

Installing the ARP Weld Bungs is straightforward for experienced fabricators. They are designed to be welded directly into your custom components, such as tanks or housings. No special modifications are required beyond standard welding procedures. Ensure the mounting surface is clean and properly prepared before welding for optimal results. Once welded, the threaded port provides a reliable connection point for AN fittings, making your system ready for operation.

• Weld-in installation only; no additional hardware required.
• Suitable for use with steel or aluminum components.
• Ensure proper welding techniques are used to achieve a leak-proof seal.

What's Included

• One CNC-machined weld bung in your selected material (steel or aluminum)
• Threaded port compatible with -20 AN fittings
• Welding instructions and specifications (if provided)

Ideal For

• Custom fuel and oil tank fabrication
• Radiator and coolant system modifications
• Valve cover and manifold customizations
• Rear axle housing modifications
• Race car and high-performance builds requiring reliable weld-in fittings

Emissions Note

This product is intended for off-road or racing use only and may not be legal for use on public roads in all jurisdictions. Please verify local regulations before installation.