Product Feature: * Application: Fits For GM 6.6L Duramax engines for Diesel fuel pressure and vacuum testing. * Function: Gauge assembly with 6-ft Hose and quick coupler, providing a simple and convenient solution to testing your low-pressure fuel and vacuum systems in one gauge. * Specification: Equipped with a 3-1/2" gauge reading from 30 inHg to 15 PSI. * Superior Quality: This test kit is made from synthetic rubber, showing good performance and lasting service time on heat and low temperature. The gauge is equipped with high precision dial to ensure the value accurate. * Package Includes: Gauge assembly with 6-ft. hose and quick coupler. .