I wanted to change some fluid in my transmission. I was hoping to do this by setting up a vinyl hose to the outgoing port in the radiator which the transmission fluid comes out of. Does anyone know which size vinyl tubing I should use that would fit?

Also, which hole is the outgoing fluid? My understanding that it is the upper one but some confirmation would be great.

 

TransCooler hoses are usually 10mmID;
sorry don't recall which upper\lower cooler tube connection is the outlet\inlet.