Here is what I did, on the inlet and outlet of the radiator I put a short piece of hose appox. 4 inches long. Before I put it on the radiator I took it to a pluming supply and got a reducer bushing that would screw into the rubber hose. I then put a hose clamp over the threads on the reducer and slipped it on the radiator and put a second clamp on the radiator barb. I then screwed the pex fitting in and hooked up my lines. Been using it for 4 years and have not had any problems. When you buy the hose clamps make sure they are the good ones and not cheapes so they tighten down and hold good, If you use plastice pipe fitting as was suggested above most of them will not take the heat and self destruct in a year or so.