CMTOOL Exhaust Back Pressure Tester Kit — 2.5-inch Gauge, 6 ft Heat-Resistant Hose & M12/M18 Adapters

This kit is designed for mechanics and knowledgeable DIYers who need a reliable way to check exhaust back pressure without removing the exhaust system. The compact 2.5-inch dial provides clear PSI and Bar readouts, while the long, high-temperature resistant hose lets you test from inside the vehicle. Included adapters and a clamp make it simple to attach to many exhaust ports, and the rubber-covered gauge protects the instrument during routine shop use.

How does the gauge reveal exhaust problems?

The CMTOOL gauge displays back pressure in both PSI and Bar and uses a three-color band system to indicate acceptable and excessive levels. Measuring at idle and under load helps you spot restrictions, clogged catalytic converters, or collapsed pipes that affect performance.

• 2.5-inch high-contrast dial with PSI and Bar scales for quick reading
• Three color bands show safe, caution, and high-pressure ranges
• Calibration checked at factory; zero adjustment accessible if needed

What makes the hose and fittings suitable for shop use?

The 6-foot hose is molded from thickened nitrile rubber (NBR) that resists wear and tolerates temperatures up to about 70°C, so it stands up to hot undercarriage environments. Threads for common M12 and M18 adapter sizes plus a hose clamp give a secure connection to many exhaust test ports.

• 6-foot length enables testing from the driver’s seat or workbench
• NBR construction for abrasion and heat resistance
• M12 and M18 threaded adapters plus clamp for broad vehicle coverage

How do I read and interpret the results safely?

Check pressure at idle and again around 2500 rpm; the gauge’s markings help determine whether pressure is within a normal range or signals a restriction. If the pointer is off zero on arrival, you can remove the protector and reset it—this won't affect the gauge’s ability to show back pressure during testing.

• Test at idle and at ~2500 rpm to compare values
• Expect lower readings at idle and modest increases under higher revs
• Pointer reset possible after transit impact; factory calibration remains intact

How durable is the tester for repeated diagnostic work?

The gauge head is fitted with a rubber shock cover to absorb impacts and provide a nonslip grip, so it holds up to daily handling. Combined with rugged hose material and metal adapters, the kit is built for frequent diagnostics in a shop or garage environment.

• Rubber protective cover for drop and vibration resistance
• Metal adapters with standard threads for reliable attachment
• Designed for repeated use across multiple vehicle makes and models

Who this kit is for: The CMTOOL Exhaust Back Pressure Tester Kit suits professional technicians, advanced hobby mechanics, and anyone who performs engine performance troubleshooting. If you need a straightforward, portable tool to identify exhaust restrictions, verify catalytic converter condition, or confirm exhaust flow issues without disassembly, this kit offers a practical, shop-ready solution.