Aeroquip components are an excellent choice for high quality performance plumbing projects. When used in conjunction with a tube sleeve, these tube nuts allow you to finish the end of a line with professional results. The fittings are manufactured from high-quality blue anodized aluminum to be durable and lighter in weight. Please note: Eaton Aeroquip fitting tolerances are engineered to match Eaton Aeroquip hose tolerances. The use of Aeroquip fittings on hose supplied by other manufacturers and/or the use of Eaton Aeroquip hose with fittings supplied by other manufacturers may result in the production of unreliable and unsafe hose assemblies and is neither recommended or authorized by Eaton.