5/16″ Tube Sleeve

ColorFittings Tube Sleeves are precision-machined components designed to work with ColorFittings Tube Nuts to convert 37-degree flared hard lines into secure AN connections. Engineered for professional hard line plumbing, these sleeves provide the proper support and sealing surface needed for reliable, leak-free connections in fuel, clutch, oil, coolant, and hydraulic systems.

Manufactured from aerospace-grade 6061-T6 billet aluminum and finished with ColorFittings' proprietary polishing and anodizing process, these tube sleeves deliver exceptional strength, corrosion resistance, and long-term durability. Designed for use with aluminum, steel, and stainless steel hard lines, they are ideal for street performance, racing, off-road, marine, and custom fabrication applications.

For a complete hard line solution, pair these Tube Sleeves with ColorFittings matching Tube Nuts to convert flared hard lines into durable AN connections.

Finish your system with ColorFittings AN fittings, adapters, braided hose, and fitting assembly tools.

Shipping: Ships directly from ColorFittings. Items may arrive separately from other products in your order.