Billet Aluminum Thru-Frame Bulkhead Fitting - 3/8 NPT

The GSI Billet Aluminum Thru-Frame 3/8" NPT Fitting is built for builders who want both function and flawless style. CNC-machined from premium billet aluminum and finished in clear anodizing, this fitting resists corrosion and adds a high-end touch to your build.

At 3 inches long with a 7/8" diameter hole requirement, it's designed to work with most chassis frame rails. Dual 3/8" NPT threaded ports make it versatile for fuel delivery or air suspension plumbing. By routing lines through the frame, you protect them from debris, reduce clutter, and achieve a show-quality finish.

Each fitting includes a nut for a secure installation. Whether you're restoring a classic car, upgrading your C10, fabricating a hot rod, or building a race car, this thru-frame fitting delivers durability, precision, and a clean, professional look.

At GSI Machine & Fabrication, we offer a one-year warranty on all manufactured parts, covering defects upon inspection. However, we are not liable for personal or property damages resulting from misuse of our products. Note that warranties for non-manufactured parts, such as shocks or ball joints, must be handled directly with the part’s manufacturer.

Orders may be canceled before shipment, except for special-order and custom items, such as chassis products and air ride suspension. Refunds for eligible returned items will exclude shipping costs and may incur additional fees. For cancellations or issues with orders, contact our customer support at 1 (877) 951-1890 or sales@gsimfab.com.

Customers are responsible for all customs fees, duties, and taxes on international orders. Once your package is shipped, we are not liable for damage, theft, or loss during transit. Please inspect your delivery promptly and report any issues within 48 hours. For international shipments, local policies may cause delays, and additional documentation may be required. Always ensure shipping details are accurate to avoid additional costs.