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TracTuff M18 to AN Adapter


The M18 to -6 Male Flare adapters are now CNC machined from stainless steel.

Same specs from the original Honda joint used on the S2000 F20C/ F22C to route coolant from the block to the oil cooler assembly and commonly used on K Series engines that were not originally equipped with an oil cooler, to get water to the OEM oil cooler. Now available to plumb anything that might need to get water to.

Please consider the k series thermostat port adapter or the k series water passage adapter to complete the coolant loop. Both of those products would be a low-side return.

NOTE: Rather low demand on the other AN sizes means I will continue to machine the hose barb and hex off of new OEM joints and weld your choice of a -8 or -10 male flare. The OEM zinc finish and the original thread paste shown will not survive the welding process and will look different from the product photographed.

The product is machined and welded as orders are placed... so allow for a few days for the order to ship. All sales are final on this item. You will want to plate or paint this fitting to keep it from rusting. I recommend Loctite 5452 as a fast cure thread sealant or Loctite 561 if you have 24 hrs. to cure. Loctite 561 may be more readily available but is my last recommendation. All must be applied thoroughly into the threads.

  • -6 is equal to a metal tube with an OD of 3/8" (.3750")
  • -8 is equal to a metal tube with an OD of 1/2" (.5000")
  • -10 is equal to a metal tube with an OD of 5/8" (.6250")
  • -12 is equal to a metal tube with an OD of 3/4" (.7500")

Understand that not all "AN" hose is the same and there will be variances from manufacture to manufacture as well as in different types of hose from the same manufacture.

EXAMPLE: XRP Pushlock hose has an ID of 3/8" for -6, 1/2" for -8, 5/8" for -10, 3/4" for -12 but XRP CPE or XR-31 hose has an ID of 11/32" for -6, 7/16" for -8, 9/16" for -10, 11/16" for -12.