Hi guys..daughters radiator is leaking from below the bottom nut (see pic)...it is definitely from below as I've checked all around the top by taking the cap off...it is a radiator on a combination boiler system...I've tried tightening it and pushing ptfe tape into it but still leaks...I'm assuming the whole connector needs replacing...I've tried turning the connector feeds off to isolate the radiator but still leaks...would I need to replace the connector now you think ?