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These covers are just what you need to make sure no damage is done to the TGV plugs when they are left disconnected after TGV Deletes are installed. Caps fit all cars with the 5 pin TGV plug including WRX/STi/FXT models from 2007 to 2020. These plugs are the same as what is built into the end of the factory TGV valves. The holes in the end of the plugs are capped with clear silicone plugs that create a nice water tight seal as there would be when connected to factory parts. We also include zip ties so that the TGV section of the harness can be properly tied back to the main harness. Tuners have reported that improperly secured TGV plugs can bounce around on the engine and potentially cause false knock events.