Last trip to Princess Auto I was looking for a rad cleaner that Guys are using and talking about on tech sites . No luck finding one so decided to try making it .
Using a piece of 1/2" copper
Drilled a bunch of small holes to try out first . May go back later and drill them a little bigger or at least every second one .
Solder an end cap and brass 1/4 female thread bushing
Attach an air line fitting. I also put an in line air valve so it won't run continually.