Parts from used Teledyne Laars pool heater, model EG400. I'll sell you whatever you need. The heater was installed in 1981 and retired 30 years later in 2011, but it was used very little during most of its lifetime, all of which was indoors. You can see from the pictures that the heat exchanger is pretty clean. I also have a few other parts from this heater, and a Honeywell LA4031A pool aquastat for sale.