Like this one?Was having a debate the other day about the oldest piece of kit still running on my tank! Not squirreled away in some dusty old closet, but actually still running on a tank ..... and NOT including the actual tank. I just retired an old orange Dupla float switch that I bought in 1988, so now it's my MTC ProCal at only 20 years young (though I did have to replace the pump). What's your geezer-gear?
I also have an old Dupla-Sun metal halide fixture in my attic (2x 150 watt Power Star double ended bulbs). Still worked the last time I plugged it in, but hummed like crazy.