NPTF-to-NPTF steel hydraulic hose adapters are typically used in hydraulic hose assemblies to convey fuel in automotive applications. They connect compatible hydraulic hoses to pipe or equipment that has different thread sizes. These steel fittings are durable, wear-resistant, and suitable for environments where corrosion is not a concern. They have an NPTF (National Pipe Tapered Fuel) connection on both ends of the fitting. The NPTF connection (or dryseal thread) forms a tight seal when mated with the opposite gender.