Heater Hose AdapterApplications: All K series engines You might have noticed that the oem heater hose pipe on some K series motors is actually bigger than the hose used on the heater core in a K swapped vehicle. This makes it almost impossible to stretch the smaller hose over the bigger pipe. The K Tuned heater hose adapter solves the problem and allows you to match the pipe to the proper hose size for a clean install. Finished in anodized black.