The INNOVA 3641 GM TBI Fuel Injection Adapter from EQUUS Products was designed by a team of ASE certified technicians to help make fuel pressure testing easier on vehicles with TBI systems. The 3641 includes an easy installation brass adapter, a 2 foot extension hose for checking pressure at the filter source and can be used with most fuel injection pressure testers, including the INNOVA 3640 Fuel Injection Pressure Tester and 3642 Pro Fuel Injection Pressure Tester Kit.