Midland Industries 704039-06 Sae 45-degree Flare Plug

Product Description

The MIDLAND INDUSTRIES 704039-06 is a lead-free brass SAE 45-degree flare plug designed to seal the end of a male flared tubing connection. It accepts a 3/8-inch male flare with a 5/8-18 thread and is rated for temperatures from -40 to 250 degrees F. This fitting is used by plumbers and HVAC technicians to cap off active or unused tubing runs in refrigeration, fuel gas, and fluid systems. The lead-free brass construction meets modern potable-water and low-lead plumbing standards, making it suitable for a wide range of residential and commercial service applications.

This plug is appropriate for use in systems that require a secure, pressure-rated seal on a male flared tubing end. It is compatible with aluminum, brass, copper, or steel tubing, making it versatile across HVAC refrigerant lines, fuel lines, and hydraulic or pneumatic tubing assemblies. The SAE 45-degree flare profile is a standard configuration encountered in residential and light commercial service work, and this plug fits directly into that existing geometry without adapters.

Key Features

• Lead-free brass construction meets low-lead requirements for plumbing and fluid systems
• SAE 45-degree flare seat provides a reliable, leak-resistant metal-to-metal seal
• 3/8-inch connection size with 5/8-18 thread for standard flare fitting compatibility
• Rated from -40 to 250 degrees F for broad temperature application range
• Compatible with aluminum, brass, copper, or steel tubing

Compatibility

Designed for use with aluminum, brass, copper, or steel tubing in SAE 45-degree male flared connection applications. Fits standard 3/8-inch flare tubing assemblies with 5/8-18 thread.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician. Before installing, isolate the line and relieve all system pressure or refrigerant charge according to applicable codes, including IPC and IFGC guidelines. Use an appropriate flare wrench to seat the plug squarely against the flare cone without over-tightening. Inspect the flare seat surface for damage or debris before assembly to ensure a leak-free seal.