Eaton 131X3 Steel Inverted Flare Plug 3/16 in Od 3/8-24 Unf

Product Description

The EATON 131X3 is a steel inverted flare tube plug designed to seal 3/16-inch OD tubing lines using a 45-degree flare seat and a 3/8-24 UNF threaded connection. It is used to cap or terminate inverted flare tube ports in hydraulic, pneumatic, brake, and fuel line assemblies. The 131X3 is rated for up to 2000 psi working pressure and a maximum working temperature of 250 degrees F, making it suitable for demanding fluid power and automotive service applications. Licensed plumbers, hydraulic technicians, and fleet mechanics are the typical installers for this type of fitting.

The 131X3 is intended for use in systems that use inverted flare tube connections conforming to SAE, ASME, and MS standards. Common applications include brake line service, fuel system repairs, and hydraulic manifold porting in both light-duty and commercial vehicle platforms. The 3/8-24 UNF thread pattern is standard across a wide range of OEM and aftermarket inverted flare fittings, making this plug a straightforward service part for bench work or field repairs.

Key Features

• 45-degree inverted flare seat matches standard SAE inverted flare tube geometry
• 3/8-24 UNF thread provides broad compatibility with common inverted flare ports
• Steel construction supports up to 2000 psi maximum working pressure
• Rated to 250 degrees F continuous service temperature
• Compact 0.53-inch overall length suits tight installation spaces
• Conforms to ASA, ASME, MS, and SAE standards

Compatibility

Designed as a standard replacement or service plug for inverted flare tube assemblies using 3/16-inch OD tubing with a 3/8-24 UNF threaded port and a 45-degree flare seat.

Installation Notes

Installation is typically performed by hydraulic technicians, brake specialists, or fleet mechanics using standard flare-fitting hand tools. Depressurize and drain the line or system before removing or installing any fitting. Do not overtighten steel fittings into soft-metal or plastic port bodies, as this can damage the seat or thread. Follow applicable SAE and ASME guidelines for tube fitting torque and assembly practices.