Teledyne Laars 10010806 Copper Heat Exchanger, 18 Tube Assembly, with glass-lined tubs, 4500I (indoor), 4000E (outdoor), Previous Part #20010806
Used on the following models:
AP4000, AP4500, HH4000, HH4500, PH4000, PH4500, PW4000, PW4500, VW4000, VW4500,
MT4000, MT4500.