I found this interesting. Take a look at the second picture in the link, sure looks like a single, 120mm fan pc radiator is used to help cool the air venturing compressor....https://www.pyramydair.com/blog/2017/01/air-venturi-air-compressor-part-2/ I'm planning on using a double, 120mm fan PC radiator for my yong heng. I'll use the stock pump, and a 2.5gal reservoir. Plumb the intake for the radiator off the discharge from the cooling head and return it to the reservoir. Hopefully, cooler than it went in...