Here it is...a marine transmission cooler. This will be put in the upper radiator hose of my 91' Honda Civic. The two end nipples are 1 1/4" in diameter, the approximate size as the upper radiator hose. The two other fittings on the side will carry fuel in one fitting and out the other, and will heat the fuel to the temp of the coolant coming from the engine....approx. 192*.