This is the outlet pipe from the thermostat housing. My son has a 2005 Mustang and he got the wrong type. This one is angled and his is supposed to be straight. Ford's stock unit is cheap plastic crap and so he decided to upgrade to metal, but again got the wrong type. Anyway, this one would fit an Explorer (1997-2008). It may also fit other years of Mustang, but the key is that the pipe is angled not straight. I'll also include the old thermostat which is only a couple years old, and was working fine.