CMTOOL Exhaust Back Pressure Tester Kit — 2.5in Dual-Scale Gauge, 6ft Heat-Resistant Hose

The CMTOOL Exhaust Back Pressure Tester Kit is a complete diagnostic set that measures exhaust back pressure with a 2.5-inch dual-scale gauge, 6-foot high-temperature hose, adapters and clamps—neatly stored in a fitted carrying case.

Diagnosing exhaust restrictions, clogged catalytic converters or other flow issues is faster when you can accurately read back pressure near the driver's seat. This CMTOOL kit combines a large, color-coded gauge with an extended nitrile rubber hose and M12/M18 adapters so technicians and DIYers can test at idle and under a 2,500 rpm load without moving around the vehicle. Everything fits into a durable molded case for transport and storage.

How do I use this tester to check exhaust performance?

Attach the appropriate M12 or M18 adapter to the exhaust port, connect the hose, and bring the 2.5" gauge into the cabin or a convenient viewing position. Run the engine at idle and then at 2,500 rpm to compare readings against expected ranges; lower pressure indicates better flow.

• Choose M12 or M18 adapter to match your vehicle’s fitting.
• Clip hose to adapter, secure with one of the included clamps.
• Read gauge values in PSI and bar; color ring shows status.
• Compare: target <1.25 psi at idle, <3 psi at 2,500 rpm.

What makes the gauge and hose reliable for workshop use?

The gauge is a high-definition 2.5-inch instrument with dual pressure units and a three-color visual band to speed interpretation. The hose is a thickened NBR nitrile rubber rated for high wear and around 70°C, enabling tests from the driver’s seat without heat damage.

• 2.5" gauge with PSI and bar scales and shock-absorbing rubber cover.
• Three-color status indicator for quick pass/fail reading.
• 6-foot nitrile hose resists heat and abrasion for workshop longevity.
• Pre-calibrated gauge; pointer adjustable to zero if shifted in transit.

Which accessories are included and how do they help on the job?

The kit is supplied with threaded adapters and two hose clamps so you can make a sealed connection to most exhaust access points. A custom-molded carrying case keeps each component organized, protected and ready to go between jobs.

• M12 and M18 threaded adapters for common test ports and fittings.
• Two hose clamps ensure leak-free connections during measurement.
• Custom-molded black case prevents loss and protects tools in storage.
• Compact layout makes it easy to carry and set up at roadside or in-shop.

Who is this kit designed for? If you are an automotive technician, fleet mechanic, or an experienced DIYer who diagnoses exhaust restrictions, emissions system issues, or performance losses, this CMTOOL back pressure tester provides fast, clear pressure data and the hardware to get accurate readings without repeated trips under the vehicle. It’s built to be portable, durable and straightforward to operate so you can diagnose exhaust flow problems quickly and return vehicles to service with confidence.