Application: Fits for Diesel fuel pressure and vacuum testing on GM 6.6L Duramax engines。 Feature: Diesel fuel pressure and vacuum testing on GM 6.6L Duramax engines Gauge assembly with 6-ft. hose and quick coupler 3. 3-1/2" gauge reads 30 inHg to 15 PSI。 Superior Durability: Premium brass parts are sturdy, non-rusting, and long-lasting. The reinforced rubber gauge hose endures torsion, temperature and pressure to provide a long lasting service life. Equipped with a hook (Hook for Hands-Free Use)。 Function: .