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 100074621:HEAT EXCHANGER ASSY,110U & 310U,OUTDOOR (replaces 319143-460) (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 100074621 Product ID: 55289 AO SMITH 100074621:HEAT EXCHANGER ASSY,110U & 310U,OUTDOOR (replaces 319143-460) $397.50 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 »