LLY - LBZ - LMM Duramax. This situation is especially common with higher mileage trucks in northern rust-belt climates. Multiple adapters are shown in the photo to allow different views.
LLY–LML Duramax Boost Leak Tester – Turbo System Pressure Testing Tool
Stealth Series LLY–LML Duramax Boost Leak Tester – Turbo Pressure Testing Tool
