I'm cleaning my condensate pump and now need a replacement O-ring for the submerged bottom base impeller. Oring is slightly damaged and swollen enough that it seems to want to retire. Anybody know where I can find one, preferably several, for a Hartell KTP 15X 1UL condensate pump? I'm tempted to just buy a new pump since they're not too expensive, but I'd prefer to repair it if possible.