Parker 639F-6 Brass Flared Tube Plug 3/8 in 45 Degree

Product Description

The PARKER 639F-6 is a brass flared tube plug designed to seal off 3/8-inch OD tubing lines using a 45-degree flare connection. It threads in with a 5/8-18 thread and provides a leak-tight termination point on hydraulic, refrigeration, or fluid-transfer lines. Rated to 1000 psi maximum working pressure and up to 250 degrees F, this plug handles demanding service conditions in both stationary and mobile equipment. At 0.78 inches overall length and 0.06 pounds, it is a compact fitting intended for use wherever a flared line must be capped or blanked off during service, testing, or system modification.

This plug is used in residential and commercial HVAC systems, refrigeration equipment, hydraulic circuits, and fuel or fluid lines where a 45-degree SAE flare fitting is already present. It is a standard plug for capping unused ports on manifolds, blocking off branch lines during pressure testing, or sealing decommissioned tubing runs. Licensed HVAC technicians, plumbers, and hydraulic service professionals install this type of fitting as part of routine system maintenance and modification work.

Key Features

• 45-degree SAE flare end connection seals directly into any matching flared tube seat
• 1000 psi maximum working pressure for use in high-pressure fluid and refrigerant lines
• Rated to 250 degrees F maximum working temperature
• 5/8-18 thread size for a secure, leak-tight fit
• Brass construction resists corrosion in refrigerant, hydraulic fluid, and water service
• Compliant with SAE J512, SAE J513, and UL Listing standards

Compatibility

Designed as an OEM-style replacement or service fitting for systems using 3/8-inch OD tubing with 45-degree SAE flare connections conforming to SAE J512 and SAE J513 specifications.

Installation Notes

Installation is performed by licensed HVAC technicians, plumbers, or hydraulic service professionals. Always depressurize and purge the line before removing any fitting or installing this plug. Use a properly sized flare wrench to avoid rounding the fitting. Do not overtighten, as brass fittings can be damaged by excessive torque; hand-snug plus a controlled turn with a wrench is standard practice for flare fittings.