A/C Leak Testing Kit (R134a/R1234yf) - Mastercool

Part #: 53551

The Mastercool 53551 A/C Leak Testing Kit provides a professional, non-refrigerant solution for precisely identifying leaks in both R134a and R1234yf automotive air conditioning systems. Engineered for automotive technicians, this comprehensive kit utilizes a nitrogen-hydrogen tracer gas mix to accurately pinpoint leaks, facilitating efficient diagnostics while adhering to modern environmental standards.

Key Features

  • Dual A/C System Compatibility: Includes low-side couplers and adapters, ensuring compatibility with both R134a and R1234yf A/C systems.
  • Precision High-Pressure Regulator: Features a durable single-stage regulator with a 1/4-inch SAE flare outlet, T-handle for easy adjustment, and dual gauges for clear pressure monitoring. It connects securely to CGA350 (US) standard nitrogen-hydrogen tracer gas tanks.
  • Advanced Combustible Gas Leak Detector: The Intella-Sense III utilizes a heated tin oxide sensor for rapid detection of nitrogen-hydrogen tracer gas with a response time of less than 1 second, minimizing false alarms. Its adjustable sensitivity, LED display, and powerful microprocessor provide intelligent feedback for pinpoint accuracy.
  • Integrated Pressure Monitoring Adapter: An in-line leak testing adapter includes a 1/4-inch SAE hose connector, an integrated pressure gauge (700 psi / 50 bar), and a ball valve, allowing for precise control and monitoring during tracer gas insertion.
  • Durable Charging Hose: A 38-inch yellow nylon barrier charging hose is rated for 800 psi working pressure and 4000 psi burst pressure, meeting all EPA, SAE, and UL standards for professional use.

Applications

This Mastercool A/C Leak Testing Kit is an essential tool for automotive technicians and mechanics performing diagnostics on modern vehicle air conditioning systems. It is ideally suited for pressure testing R134a and R1234yf A/C systems without introducing refrigerants, making it an effective method for identifying leaks in various automotive and industrial settings where precise, non-refrigerant-based leak detection is required. Its robust construction supports rigorous daily use in professional workshop environments.

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List: $749.99 Save: $277.31

$472.68

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  • Model: 424355
  • Shipping Weight: 14lbs
  • UPC: 700376535518
  • Manufacturers Part #: 53551
  • Manufactured by: Mastercool
  • Also Known As: MSC53551, MSC-53551, ML53551

This product was added to our catalog on Wednesday 13 May, 2026.

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