Description The TracTuff M28 x 1.0 port adapter starts life as a Genuine Honda plug/ cap that has been stripped, machined, drilled, and prepped for welding either a -6, -1o, or -12 male flare so you can use the odd port to feed coolant to an accessory. Most popular with customers who have purchased my EXTREME CLEARANCE water neck kit and need a heater core feed. NOTE: The fitting has been stripped of the original zinc plating in order to weld and will rust if not painted or plated. The M28 x 1.0 AN Adapter screws into the large threaded passage just above the oil filter… if your block was not equipped with an oil cooler, you will need to remove a hex plug that is deep inside that passage. If your block was originally equipped with an oil cooler and you are no longer using the oil cooler assembly, you will need my Block Port Block Off (shown below). The M28 x 1.0 AN Adapter requires the use of a Honda crush washer (90401-PR4-000), which is not supplied.
