its from Advanced there s only one from advanced that actually is suppose to work for the thermostat though they sell 2 different ones, Ring is in the port its supose to be in, It sees to be leaking from oe of the bolts....I personally am nw to the motor part of Subies, I have only done After Market Suspensions, Exhausts and Maifolds along with the Brakes, So lets just say This is going to be a interesting Read because I like the way these 4 bangers are made