Parker 151F-5-4 Brass Male Run Tee 5/16 in Flare X Mnptf

Product Description

The PARKER 151F-5-4 is a brass male run tee designed for flared tube connections in refrigeration, HVAC, and fluid-handling lines. It provides a branch takeoff from a main tube run while transitioning to a male pipe thread port, making it a common fitting choice when routing copper tubing to a threaded component or manifold. The tube end accepts a 45-degree flare on 5/16-inch OD tubing, and the branch port is 1/4-18 NPTF male thread. Construction is brass throughout, providing corrosion resistance and reliable seating on flared connections. Plumbers, refrigeration techs, and HVAC installers use this fitting when building or repairing tubing assemblies.

This fitting is suited for residential and light commercial HVAC systems, refrigeration circuits, and plumbing lines where flared copper tubing transitions to a threaded male connection. The male run tee configuration lets a tech maintain flow through the main run while adding a branch outlet, eliminating the need for additional adapter fittings at split points in the line. It is typically installed in low-pressure to moderate-pressure fluid or refrigerant tubing systems.

Key Features

• 45-degree flare end connection accepts standard 5/16-inch OD flared copper tubing
• 1/4-18 NPTF male thread provides a leak-resistant, dryseal pipe thread connection on the branch port
• Flare x MNPTF end configuration supports inline run with a threaded branch takeoff
• All-brass construction resists corrosion in refrigerant and fluid service
• Compact, lightweight at 0.09 pounds — fits in tight equipment cabinets and line sets

Compatibility

Designed as an OEM-style replacement or new-installation fitting for HVAC, refrigeration, and plumbing tubing assemblies using 5/16-inch OD flared copper tube and 1/4-18 NPTF male threaded connections.

Installation Notes

Installation should be performed by a licensed HVAC technician, refrigeration mechanic, or plumber. Shut off and recover any refrigerant or depressurize the fluid system fully before disassembling existing connections. Use a properly sized flaring tool to produce a clean, uniform 45-degree flare seat before tightening — a damaged or off-angle flare is the most common cause of leaks at this fitting type. Do not overtighten the flared nut; snug plus a controlled quarter-turn is standard practice for brass flare fittings.