Proto J3754T Combination Flare Nut Wrench 9/16 in

Product Description

The PROTO J3754T is a double-end combination flare nut wrench designed for use on flare fittings in refrigeration, HVAC, and plumbing lines. The wrench features a 9/16-inch opening on both ends with a 12-point design that provides multiple contact angles on hex fittings and reduces the chance of rounding fasteners under load. The 15-degree head offset angle gives clearance when working in tight spaces around tubing and manifolds. Overall length is 6-15/16 inches. Constructed from steel with a satin finish that resists glare and light corrosion. This tool is a standard service item for HVAC technicians and plumbers who work regularly with flare fittings on refrigerant or gas lines.

The J3754T is suited for residential and light commercial HVAC service, refrigeration work, and plumbing applications where flare nut fittings are common. It is particularly useful when working on copper refrigerant lines, gas supply connections, and other tubing assemblies where a standard open-end wrench risks slipping. The double-end configuration and compact overall length make it practical in confined equipment compartments and line sets.

Key Features

• 9/16-inch flare nut opening on both ends for consistent sizing across a job
• 12-point engagement reduces fastener rounding compared to 6-point open-end wrenches
• 15-degree head offset angle provides clearance in tight spaces around tubing
• Steel construction with satin finish for durability and reduced glare
• 6-15/16-inch overall length balances leverage and maneuverability in confined areas

Compatibility

Designed as a standard flare nut wrench for use with 9/16-inch flare fittings commonly found in HVAC, refrigeration, and plumbing systems.

Installation Notes

This wrench is typically used by licensed HVAC technicians, refrigeration mechanics, and plumbers during line set connections and fitting service. Always recover refrigerant and depressurize lines before loosening flare fittings on refrigerant circuits. On gas lines, shut off the supply valve and verify pressure is relieved before breaking any connection. Do not use extensions on the wrench handle to apply excess torque to flare fittings, as this can deform the flare seat.