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The actual hose does not have an O-ring. It's a snap fit connection which should be snug. You need to replace the bung that screws into the radiator.
The bung (compression type fitting that screws into the radiator), has a O ring inside it to seal off against the end of the tube that gets inserted to lock into it. This inner bung O ring is either missing, or needs to be replaced.
The bung (compression type fitting that screws into the radiator), has a O ring inside it to seal off against the end of the tube that gets inserted to lock into it. This inner bung O ring is either missing, or needs to be replaced.
Yep!...........
One thing that I notice is the bung itself looks different than the one in my car. I wonder if it was repaired. I'll post pics later.