Vehicle-specific boost leak testers for Duramax 6.6L.
Check the engine and year in the product name, or text us a photo of your setup and we'll point you to the right kit.
Four testers cover every Duramax 6.6L. For LB7, LLY, LBZ, LMM and LML engines, there are three kits to choose from. The Basic Kit is a 30 PSI kit you fill through a Schrader valve. The Pro-Kit is a 60 PSI kit with a 5 ft extension line and shut-off. The Shop Pro-Kit is a 60 PSI kit with a regulated 5 ft extension line. The 2017 and newer L5P uses its own premium 30 PSI tester.
| Kit | Fits | Gauge | Fill / extension | Best for |
|---|---|---|---|---|
| Basic Kit | LB7, LLY, LBZ, LMM, LML | 30 PSI | Tire valve (fill with a tire inflator) | DIY owners, occasional testing |
| Kit with 5 ft extension | LB7, LLY, LBZ, LMM, LML | 60 PSI | 5 ft line with shut-off valve and shop air fitting | Testing with shop air from outside the engine bay |
| Shop Kit (regulated) | LB7, LLY, LBZ, LMM, LML | 60 PSI | 5 ft line with regulator and shut-off valve | Shops: set an exact test pressure every time |
| L5P Kit | L5P (2017+) only | 30 PSI | See listing | 2017+ trucks; the other kits do not fit the L5P |
