Collection: Tube Nuts, Sleeves & Hardline Adapters

ColorFittings tube nuts, tube sleeves, and AN-to-tube compression fittings for building hard aluminum line plumbing systems — fuel, brake, and transmission lines. Sized for 1/4", 5/16", 3/8", 1/2", 5/8", and metric (5.5mm/6.0mm) hardline tubing.