I'm curious if anyone has seen these radiators before? I've done some search on the web, plus have shown them to my brothers who have worked in the plumbing/heating industry for 20+ years and they have never seen anything like them before. There are approx. 10 in my house (built 1926 and I think it still has the original boiler) and one has now sprung a leak. I'm thinking I may need to replace it.