Hi, is anyone aware of a source for replacement red silicone gaskets for between sections of Duravent pipe? My pipe for my Harmon 61 is about 15 years old and a couple of gaskets have deteriorated and I am having difficulty finding just the gaskets, seems a shame and expensive to replace elbows and sections which are still solid for the sake of a gasket. Many thanks, I had a look through the forum and did not find anything.