Eaton 131X4 Steel Inverted Flare Plug 1/4 in 7/16-24 Unf

Product Description

The EATON 131X4 is a steel inverted flare tube plug designed to cap or seal flared tube lines in hydraulic, pneumatic, and fluid-transfer systems. It features a 45-degree flare end connection with a 7/16-24 UNF thread, fitting a 1/4-inch tube OD. The plug is rated for a maximum working pressure of 2000 psi and a maximum working temperature of 250 degrees F (121 degrees C), making it suitable for demanding service environments. The overall length is 0.54 inches and the inside diameter measures 0.312 inches. Licensed plumbers, HVAC technicians, and hydraulic system installers use this plug to terminate or isolate flared tube connections during service, repair, or system modification.

This inverted flare plug is used in residential and light commercial applications wherever flared tube lines require a secure, pressure-rated cap. Typical install scenarios include sealing off unused ports in refrigeration lines, hydraulic circuits, and fuel or oil systems that use SAE 45-degree inverted flare fittings. It conforms to ASA, ASME, MS, and SAE 040109 standards, making it appropriate for use in systems where standardized fitting specifications are required.

Key Features

• 45-degree inverted flare end connection for secure, leak-resistant sealing
• 7/16-24 UNF thread for precise, standardized fitment
• Rated to 2000 psi maximum working pressure
• Rated to 250 degrees F (121 degrees C) maximum working temperature
• Meets ASA, ASME, MS, and SAE 040109 standards
• Steel construction for durability in pressurized fluid and refrigeration line applications

Compatibility

Designed as a standard SAE 45-degree inverted flare plug for 1/4-inch tube OD lines with 7/16-24 UNF thread. No specific OEM model compatibility was provided in the product data.

Installation Notes

Installation should be performed by a qualified HVAC technician, plumber, or hydraulic system mechanic familiar with flared tube fittings. Always depressurize and isolate the line before removing or installing any fitting. Do not overtighten — hand-snug plus a controlled turn with a properly sized wrench is standard practice for flare fittings. Verify thread engagement and inspect the flare seat for damage before applying system pressure.