Kastar GM TBI Fuel Injection Thru Filter Test Set (With Manifold): Kastar GM TBI fuel injection thru filter test set with manifold is a set that has adapters (including manifold) for testing fuel pressure at the filter on GM TBI fuel systems. Selecting the same adapter as the fuel filter, the adapter can then be screwed onto the manifold by hand. The manifold connects to fuel lines in place of fuel filter. The Kastar GM TBI fuel injection thru filter test set can be used with all Kastar Tools Fuel Injection Testers and Cleaners, or others with a standard Schrader adapter.