We're really sorry... ...we don't currently have that one in stock Please add your email and we'll notify you when it's back AO SMITH 100074622:HEAT EXCHANGER ASSY,510U,INDOOR (replaces 319143-461) (Back to product) Home » Parts » Water Heater Parts » AO Smith Parts See More Products Like this One (5814 Items) No Product Image A. O. SMITH 100074622 Product ID: 55290 AO SMITH 100074622:HEAT EXCHANGER ASSY,510U,INDOOR (replaces 319143-461) $488.25 Qty To ensure the correct part, please enter the manufacturers name, model and serial number of your heater: Description Email Friend Ask a Question About this Product Return Policy | Shipping Policy « Previous | Next »