Radium Engineering VW/Audi EA888 Fuel Rail Plumbing / Port Injection - 20-0889-PK

The Radium Engineering 20-0889-PK Fuel Rail Plumbing Kit is the purpose-built companion fitting set for the Radium 20-0889 port injection fuel rail on VW and Audi EA888 engines. If you're upgrading or restoring the port injection system on your EA888-powered Volkswagen or Audi, this plumbing kit provides all the adapter fittings and plugs needed to make a clean, bolt-on connection to the factory fuel feed line — no fabrication, no hunting for fittings separately. It's the detail-oriented solution that makes the 20-0889 fuel rail installation genuinely plug-and-play.

Key Features & Benefits

• Complete OEM Fuel Line Connection: The kit includes all necessary fittings and plugs to connect the Radium 20-0889 fuel rail directly to the factory fuel feed line, eliminating guesswork and sourcing individual AN fittings on your own.
• Bolt-On Installation: Designed as a straightforward bolt-on affair with the OEM fuel line — no special tools are required, keeping installation accessible for the home builder or shop technician alike.
• 8AN ORB to 8.5mm Barb Fitting Included: The specific barb fitting bridges the Radium rail's 8AN ORB end port to the factory-style fuel line, ensuring a secure and leak-resistant connection.
• Port Plugs Included: Both the 8AN ORB plug and 6AN ORB plug are included to cap unused ports on the fuel rail cleanly, preventing leaks and keeping the installation tidy.
• Pairs with a Purpose-Built Upgrade Rail: The 20-0889 fuel rail (sold separately or as a bundle) features a 0.7-inch inner bore, lightweight anodized aluminum construction, and the ability to fit under the factory engine cover — this plumbing kit is the finishing piece that makes that rail a complete system.
• Supports Pressure-Regulated Return System Conversion: The underlying 20-0889 rail can be converted to a pressure-regulated return system, and having the correct plumbing kit on hand gives you the flexibility to configure your fuel system as your build evolves.

Specifications

• Part Number: 20-0889-PK
• Compatible Fuel Rail: Radium Engineering 20-0889 Port Injection Fuel Rail (VW/Audi EA888)
• Included Fittings: 8AN ORB to 8.5mm Barb Fitting, 8AN ORB Plug, 6AN ORB Plug
• Rail End Port Thread (on 20-0889 rail): 8AN ORB
• Rail Center Upper Port Thread (on 20-0889 rail): 1/8" NPT
• Rail Center Lower Port Thread (on 20-0889 rail): 6AN ORB
• Fuel Rail Inner Bore (20-0889): 0.7 inch
• Rail Construction (20-0889): Lightweight aluminum with anodized surface finish

Fitment

This plumbing kit is designed exclusively for use with the Radium Engineering 20-0889 fuel rail, which fits the following EA888-equipped VW and Audi vehicles:

• 2016+ Audi TT
• 2014+ Audi S3
• 2015+ Audi A3
• 2016+ Audi A4
• 2018+ Audi A5
• 2016+ Audi A6
• 2014+ Porsche Macan
• 2019+ Volkswagen Arteon
• 2018+ Volkswagen Atlas
• 2015+ Volkswagen Golf
• 2014+ Volkswagen Jetta
• 2016–2017 Volkswagen Passat
• 2014–2017 Volkswagen Beetle

Important Note: The 20-0889 fuel rail is directly compatible with European-spec vehicles only. North American market vehicles did not receive port injection from the factory. Conversion of the OEM system is possible and information is available online, but the rail and this plumbing kit are designed for vehicles already equipped with the port injection system. Verify your vehicle's fuel system configuration before ordering.

Additionally, the 20-0889 is an upgrade rail — OEM or OEM-equivalent fuel injectors must be used. It is not a top-feed conversion rail. Consult your tuner for injector recommendations and the injector manufacturer for correct dimensional specifications.

What's in the Box

• 1x 8AN ORB to 8.5mm Barb Fitting
• 1x 8AN ORB Plug
• 1x 6AN ORB Plug

Note: The 20-0889-PK is the plumbing/fittings kit only. The Radium Engineering 20-0889 fuel rail itself and stainless M6x1mm mounting screws are listed separately by Radium Engineering and may be sold as a bundle depending on configuration — verify what is included at time of purchase.

Why Buy from ThreePiece.us

At ThreePiece.us, we specialize in performance and OEM-upgrade parts for enthusiast vehicles — so when you're sourcing a detail-critical component like the Radium Engineering EA888 fuel rail plumbing kit, you're buying from a team that understands how the pieces fit together. Every order ships with free shipping, and we offer financing through Affirm so you can build your fuel system now and pay over time. Have a fitment question before you order? Our team is here to help you confirm compatibility with your specific EA888 application.

Frequently Asked Questions

Q: What does the 20-0889-PK plumbing kit actually include?
A: The kit includes an 8AN ORB to 8.5mm barb fitting, an 8AN ORB plug, and a 6AN ORB plug. These fittings allow you to connect the Radium 20-0889 fuel rail to the factory fuel feed line and cap the remaining ports cleanly.

Q: Do I need the 20-0889 fuel rail separately, or is it included in this kit?
A: The 20-0889-PK is the plumbing/fittings kit only. Based on Radium Engineering's product listing, the fuel rail (20-0889) and mounting screws are separate line items. Check the bundle options available at ThreePiece.us or contact us to confirm exactly what configuration you need for your build.

Q: Will this kit work on my North American VW or Audi with an EA888?
A: The underlying 20-0889 fuel rail is designed for European-spec EA888 vehicles that came equipped with port injection from the factory. North American EA888 vehicles did not receive port injection at the factory, so you would need to address that conversion first. The plumbing kit connects the rail to the OEM fuel feed line once the rail is properly installed.

Q: Do I need any special tools to install this plumbing kit?
A: No special tools are required. Radium Engineering designed the 20-0889 system — including this plumbing kit — for straightforward installation. Radium also provides installation instruction PDFs on their website for reference during your build.