Mastercool 53040 nitrogen pressure testing kit – leak checks made easy

Need to test for leaks before charging your system? The Mastercool 53040 kit is purpose-built for HVAC and automotive A/C leak testing using nitrogen—without refrigerant in the system. Designed for accuracy, safety, and convenience in the field.

What you'll find on this page

• ✅ Built for HVAC pros and A/C techs
• ✅ High and low pressure gauges
• ✅ What’s included in the kit
• ✅ Download instructions and brochure

Built for HVAC pros and A/C techs

This kit is ideal for testing sealed systems before refrigerant charging. Whether you’re checking a mini-split, commercial chiller, or auto A/C line, this tool makes sure you find leaks fast.

• ✅ Designed for HVAC/R and automotive use
• ✅ Regulator keeps pressure on at all times for consistent readings
• ✅ T-handle allows smooth, adjustable pressure control

High and low pressure gauges with protection

The 53040 regulator comes with dual easy-read gauges, helping you monitor system pressure at every step.

• ✅ 63mm (2-1/2”) gauges with rubber guards
• ✅ High pressure gauge: up to 4400 psig (300 bar)
• ✅ Low pressure gauge: up to 1000 psig (70 bar)
• ✅ 1/4” SAE flare outlet with control valve

What’s included in the 53040 kit

Everything you need to start pressure testing straight out of the box.

• ✅ Mastercool 53040 nitrogen pressure testing regulator
• ✅ Yellow 3/8" charging hose
• ✅ Leak testing adapter
• ✅ R410A/R32 straight adapter: 1/4" FL-M x 5/16" swivel-F
• ✅ Durable blow-moulded case

Download instructions and brochure

Want all the specs and setup info? Grab the downloadable docs below for full guidance.

• ✅ Click here to download the brochure (PDF)
• ✅ Click here to download the instruction manual (PDF)

Mastercool's 53040 kit is a smart investment for every technician who needs reliable nitrogen pressure testing on-site or in the workshop.