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Wisconsin | Reason I say I've never seen one like that, is you have more going on than usual. The side port, is that an air bleed? the center square part, the o ring, the round center part, the hex on the hose barb part. I'm guessing that turning the hex unscrewed and loosened the o ring seal bleeding air out the side port. The screw and "nut" fell inside the radiator, so you're going to lose the air bleed part, or make it into a tee with that port open and seal it with a screw and gasket. | |
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What part do I need here? Radiator
