Mastercool Hydraulic Flaring Kit for GM Transmission Cooling Lines — 7-Flare Types, Heavy-Duty Case

The Mastercool 72485-PRC is a professional hydraulic flaring kit engineered to produce seven flare types — including GM transmission cooling line flares — quickly, consistently, and with minimal effort.

This kit combines Mastercool’s original hydraulic flaring technology with a dedicated set of GM transmission cooling line dies and adapters, delivering a complete solution for technicians who work on fuel lines, brake lines, hydraulic tubing, and GM transmission cooling systems. Built with heavy-duty materials and supplied in a custom-molded case, it’s designed to streamline repair work, reduce rework from poor seals, and keep all components organized for mobile or shop use.

How does the hydraulic ram system improve flare consistency?

The hydraulic ram applies smooth, controlled force to form each flare, removing much of the manual torque variability associated with hand tools. That ensures repeatable flare geometry and reduces operator fatigue on larger or multiple jobs.

• Hydraulic actuation for uniform pressure on each flare
• Die set stabilizing arm keeps tube alignment steady
• Reduced metal fatigue from precision-formed dies
• Magnetic adapter holder prevents dropped parts during changes

What flare types and tubing sizes can this kit handle?

The kit is designed for broad compatibility across common automotive and hydraulic tubing sizes and flare profiles. It supports several specialized flare styles used in GM systems as well as industry-standard brake and fuel fittings.

• Works with 3/16", 1/4", 5/16", 3/8", and 1/2" tubing
• Creates 45° single and double flares and push-connect flares
• Forms ISO bubble flares and GM fuel line / transmission cooling flares
• Suitable for brake line and general hydraulic flares

What accessories are included and how do they help workflow?

Beyond the hydraulic flaring tool and GM-specific dies, the kit includes a compact tube cutter and a molded case so users have everything needed for clean, finished connections. The accessories are intended to reduce trips to the bench and protect components when transporting between jobs.

• Mastercool 70027 Mini Tube Cutter for 1/8"–5/8" O.D. tubing ensures square, burr-free cuts
• High-strength steel dies that resist deformation and ensure long service life
• Magnetic adapter holder for quick, secure access to dies and adapters
• Custom-molded storage case organizes dies, adapters, and tools for transport

How durable and serviceable is the tool for professional use?

Constructed from reinforced, high-strength steel, the flaring tool is built to withstand frequent shop use and the higher pressures needed for larger-diameter tubing. Precision-formed dies are designed to minimize wear and preserve flare integrity over repeated cycles.

• Reinforced steel body for heavy-duty environments
• Precision dies minimize metal fatigue and maintain dimensional accuracy
• Magnetic holder and stabilizing arm protect components and reduce downtime
• Compact case protects the kit during storage and transport

Who is this for? The Mastercool 72485-PRC is intended for professional mechanics, fleet maintenance teams, and experienced DIYers who frequently service automotive fuel, brake, and transmission cooling lines—especially vehicles that use GM-specific fittings. If you need reliable, repeatable flares across multiple tube sizes and specialized GM profiles while keeping tools organized and portable, this kit provides an all-in-one shop-ready solution without relying on improvised adapters or multiple separate tools.