12X6X1. 12X6X1. 12X6X1. 12X6X1. 12X6X1. 71- TURBO. A Circular Disk covered in Rubber or with a Hole in the where the Edge is sometimes tensioned by a Spring that prevents Fluid from leaking at the Engine Coolant Temperature Sensor. Engine Coolant Temperature Sensor Seal Ring. PT200293 Gasket. Turbocharger Oil Line Gasket.