This is the radiator CoolingCare 2 Row Aluminum... https://www.amazon.com/dp/B07FZW6QRJ?ref=ppx_pop_mob_ap_share I have 3/4” line going to inlet and outlet pipes. That smaller under the cap is for if it overheats of course. The one I have capped is right next to the “hot in” pipe. Tomorrow I might unplug it and attach a longer hose. See what it does.