TU-32-6 6.6 L Suitable for GM Duramax Diesel Fuel System Test Kit. Application : Fits for Diesel fuel pressure and vacuum testing on GM 6.6L Duramax engines. Superior Quality : Premium brass parts are sturdy, non-rusting, and the reinforced rubber gauge hose endures torsion, temperature and pressure to provide a long lasting service life.The gauge is equipped with high precision dial to ensure the value accurate.