Aeroquip adapters are an excellent choice for high quality performance plumbing projects. This adapter is manufactured from high-quality steel to provide the needed confidence for use in extreme applications. This straight style adapter is size -04 AN on one end and 1/4' pipe thread on the other. 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.